In Coup de Grâce, in the Mess Hall of Mount Weather, Maya and Jasper are concerned because both Harper and now Monty have gone missing. Maya tells Jasper he has to make it look like everything is okay and to not do anything stupid. She leaves for the Medical Ward and starts looking through patient records as she tries to see any anomalies that might point to Monty's or Harper's whereabouts. Lovejoy enters and asks her if she's seen Thorpe. Maya tells him he just left and as Lovejoy is on his way out the door, a patient's machine beeps, signaling her treatment is done. Lovejoy remarks that she has finished her treatment an hour early, some kind of record. Maya tells Lovejoy that she thinks she saw Thorpe in the Mess Hall and Lovejoy leaves.
Maya then rushes off to the Harvest Chamber where, instead of Monty or Harper, she finds Bellamy Blake hanging upside-down. She injects him with epinephrine to wake him up and asks him if he is from The Ark and if he knows Jasper. Bellamy realizes it is Maya who is helping him and asks for her to get him down. She starts pulling off the electrodes just as Lovejoy walks in and asks what she is doing in there. Maya lies and says she wanted to know what was so special about Bellamy but he is dead. Lovejoy checks the heart monitor without realizing Maya had already detached the wires from Bellamy and starts to get Bellamy down. Once Bellamy's feet are free, Bellamy kicks Lovejoy and Lovejoy pulls a gun on him. Maya stabs Lovejoy in the neck with a scalpel and Bellamy and Lovejoy begin fighting. Maya picks up the gun and tells Lovejoy to stop but Bellamy warns her not to use it because everyone else will hear the gunshot. Lovejoy is gaining the upper hand when Echo reaches out of her cage and grabs hold of his arm to prevent him from stabbing Bellamy with the scalpel that was in his neck. Bellamy then strangles Lovejoy, killing him. He thanks Echo for her help and asks Maya if she is all right. At first, Maya is traumatized but then she resolves herself and tells Bellamy she is fine. Bellamy then re-enters from the Containment chute after changing into Lovejoy's guard uniform. He pushes the button to send Lovejoy's body down into the Reaper tunnels. Bellamy tells Maya she has done enough and should walk away. Maya says, "I'm in," and hands Bellamy Lovejoy's gun and badge. She tells him she can take him to the radio and that Monty and Harper have already gone missing. Bellamy says he wants to see the Delinquents first. Maya explains that everyone knows everyone else as she removes Lovejoy's name-tag and gives Bellamy a hat. As she cuts out Bellamy's tracking device, she asks him how he knew her name. Bellamy tells her that Clarke told him how Jasper, "couldn't stop talking about someone named Maya." She tells him to put the tracking device in his cage. As he does so, he promises Echo that he will be back.
Maya leads Bellamy through Mount Weather to an elevator, pointing out cameras and telling him how to get around. As they get on the elevator, another resident gets on with them and chats with Maya. The elevator stops and two more people get on. The elevator stops again and Maya gestures for Bellamy to exit behind the other two people. The man on the elevator notices that there is blood on Bellamy's collar. Maya claims he must have been exposed and steals the man's handkerchief to hold against Bellamy's face as she kicks the other man out of the elevator to do her job of tracing down the alleged radiation leak. Maya and Bellamy continue heading toward the dorm when they come across a group of Mount Weather preschoolers. One of them walks up to Bellamy and asks him if he is on a ground unit because his father is training to be on a ground unit. As the boy leaves, his backpack reveals the last name, "Lovejoy." Bellamy finally realizes that the mountain is not just full of guards but also civilians.
Just as Bellamy and Maya approach the dorm, an alarm is heard and the doors to the dorm close, sealing the Delinquents in. Jasper sees Bellamy and Maya on the other side of the door as Bellamy tells Maya to get him to the radio. Once to the radio, Bellamy calls into Camp Jaha, asking if anyone can hear him. Clarke picks up the radio and Bellamy tells her that the Delinquents have been locked up and that things are going to get ugly. He tells her that they need a plan that doesn't kill everyone because there are kids in there. Clarke tells Bellamy that he needs to turn off the Acid Fog and free the imprisoned Grounders. Bellamy asks Clarke to buy him some time so they won't discover him inside the mountain just yet.
In Rubicon, Maya and Bellamy call in on the radio to Camp Jaha about the Delinquents going missing. Maya has borrowed the schematics for the vent system within Mount Weather from her boss to help Bellamy get around. She also configured a portable radio for Bellamy so he can talk to Raven and Clarke anywhere. Later, Bellamy brings Dante Wallace his meal in his prison cell in Mount Weather in the quarantine area. Dante turns up the music and asks who he is. Bellamy tells him they need his help because Cage is killing the Delinquents. Dante tries to find out who is helping Bellamy but Bellamy refuses to tell him about Maya.
In Resurrection after Bellamy saves Fox from being harvested, Maya joins them and tells Bellamy they need to get Fox someplace safe. She takes them to her home where her father, Vincent Vie is sleeping on the couch. He tells Maya what she is doing is dangerous and Maya tells him that it is what her mother would have done. Her parents were part of a movement that refused the blood treatments. Her mom refused the treatment and died for her beliefs. Vincent agrees to let them stay for one night and Bellamy thanks him. Vincent warns Bellamy that the Mountain Men will never stop. Maya then takes Bellamy through Mount Weather as she tells him to get the guns and she'll worry about getting them to the Mess Hall on Level 5. Bellamy tells Maya that she is a "natural-born revolutionary," and she replies she is just trying to do what is right. Bellamy takes off to get the guns and Maya turns around to see Cage Wallace and Emerson approach. Cage tells her they were just looking for her.
In the Mess Hall, the 44 remaining Delinquents are cleaning up the bodies of the guards they killed and taking their equipment when one of the radios goes off and Cage starts talking. Monty holds up the monitor to the hall cameras to show Maya in a hazmat suit being forced down the hall by guns as Cage tells them she only has 20 minutes of oxygen in her suit so Jasper has only 20 minutes save her by surrendering. Once Maya reaches the Delinquents, she tells Jasper that Fox is okay and that Bellamy is going to get some guns in through the trash chute. Monty apologizes because he dismantled the chute but he thinks he can fix it. Jasper tells Maya he won't let her die and she tells him she won't let him surrender. As Maya is down to her last minute of air, Monty starts to frantically trying to get the trash chute open. He eventually gives up and yanks the wires out to cut power and turn the chute to manual. Miller helps him pull on the trash cute as they hear Bellamy come banging through. He tells them to give him Maya and takes her down the chute with him. Jasper follows after and they get her mask off in time. The door at the end of the chute opens and her dad appears. Bellamy and Jasper hug as Bellamy tells Jasper that Clarke is coming with an army full of Grounders. Jasper asks if that means Finn finally got his peace talks and Bellamy replies, "something like that." Later, Bellamy is leading the Delinquents through Mount Weather. He tells them they need to split up. Monty is against the idea and Miller asks who would help them. Bellamy takes them around a corner to reveal Maya and Vincent with a group of Mount Weather residents who are willing to help the Delinquents. Bellamy tells them to "stay alive. Be ready to fight. War is coming."
In Bodyguard of Lies, Bellamy asks Vincent about Maya and the Delinquents. Vincent tells him they have been moved to already searched areas because Cage has gone public with what happened on Level 5.
In Blood Must Have Blood (Part 1), Paul Tilling and another guard have captured Maya, Jasper, Fox, and Miller. They are stopped by Vincent Vie who begs Tilling to let his daughter go. Tilling tells Vincent to step aside and raises his gun at him. As Tilling steps closer to take the shot, he is suddenly shot in the head from the right side. Tilling falls dead as Vincent runs over to the air vent and pries it open, revealing Bellamy, while Miller takes down the other guard and bashes his head against the wall. Bellamy tells them to go with Vincent to the Harvest Chamber where they will be safe. Jasper and Maya decide to go with Bellamy to rescue Monty and the other Delinquents. Maya gives a hug to her father in goodbye.
As they are looking for the last 12 Delinquents an announcement is heard telling all Mount Weather residents that they have 30 minutes to get to Level 5 for quarantine lock-down. Maya realizes she is in trouble because she cannot go to Level 5 without being shot. They hear a gunshot and rush toward it, waiting until the Mount Weather Guards are gone. They find Mrs. Ryan, the woman who was hiding the last twelve Delinquents, dead. Jasper wants to go to Level 5 but Bellamy doesn't think that it is a good idea. Monty comes out and tells them he hid and had to let them kill Mrs. Ryan because he overheard that the Mountain Men know about Echo's Grounder army and are going for the Harvest Chamber. Bellamy, Maya, Jasper, and Monty then head to the Harvest Chamber. Maya discovers her dad, shot dead in the middle of the floor while Bellamy discovers every single one of the cages empty.
In Blood Must Have Blood (Part 2), down in the mines underneath Mount Weather, Clarke and Octavia are standing outside the intake door when it opens and Bellamy appears with Monty, Jasper, and Maya (in a hazmat suit) and everybody hugs. Clarke asks Bellamy if he has a plan and he tells her no, but they can speak to Dante Wallace. Maya's oxygen tank beeps, warning her she is running low on oxygen. They split up with Bellamy, Clarke, and Monty going after Dante while Octavia goes with Jasper and Maya to get her to Level 5 before she runs out of oxygen. On Level 5, Octavia and Maya are eventually discovered by the Mount Weather Guards. From the Command Center monitors, Bellamy sees their predicament just as Emerson arrives outside the Command Center door. Octavia and Maya are chased into the Mess Hall and are quickly surrounded by more Mount Weather Guards. Monty finishes the settings to irradiate Level 5 as Emerson gets ready to blow the door to the Command Center. Bellamy watches as Octavia and Maya are caught in the Mess Hall. Clarke reaches for the lever and Bellamy places his hand on top of hers, saying, "together," and they pull the lever. The Mount Weather residents begin to succumb to the radiation. Emerson realizes what they have done and takes off running. Octavia sits with Maya until Jasper runs over. Maya tells Jasper, "none of us is innocent." Jasper cradles a dead Maya asking what they had done and asks Monty how he could have let it happen.