Owen, having lost his friend, wakes up in his car. It’s unclear how long its been since Margo died, but he is still very much in grief. He wanders off into the woods, seeking something. He rests at a lake, where he has a flashback of the time he and Margo met. The two met through poetry, specifically Shel Silverstein’s A Light in the Attic, and quickly became fast friends. They read for a while, but upon realizing that her curfew has arrived, Margo runs off, leaving Owen to wonder where things will lead.
Breaking from his flashback, Owen calls Margo’s phone. When it goes to voicemail, he begins to realize she may actually be gone, and enters another flashback: The day in the hedge maze. Margo runs in and out of the maze, with Owen chasing her down. She is always out of his reach, causing him to grow distraught. He chases, and chases, and realizes he's left the flashback. Now he’s in an old, stone house. He pleads for Margo to come back to him.
Another flashback occurs, the day when Margo had an asthma attack during a football party game. Owen helps her out of it, and takes her to the hospital. A while later, Owen picks her up from the hospital, where Margo says they can’t hang out anymore. Her parents say he is a catalyst for her asthma attacks, much to Owen’s disdain. But, he is helpless, and they leave to drive her home.
Out of the flashback, Owen sits in the grass. He remembers the driving Margo back home, the anger he felt. He pulls out A Light in the Attic, and begins to read through it. The night he drive her home, Margo made him pull over. She had run off to grab some flowers: her way of making him feel better. She gives them to him, and Owen forgets all of his anger. But, they are in the middle of the road, and a car comes barreling down towards them. Owen remembers the fateful moment. In a flash, Margo had pushed him out of the way, sacrificing herself for him. It is the last straw for Owen, and he breaks down, knowing what they had has ended.