Eve tucks Alison's letter beside Charlie's necklace and keeps thinking about Alison deciding that killing Thomas was the only way to stop the nightmare. Before leaving the hidden room, Eve notices a line of ants and follows them past the stacked paintings into an impossible corridor with hospital tile, pale green walls, and a harsh chemical smell. In the middle of the hallway she finds Mo, the same battered toy chimp from her own life, switches it off, and walks on.

Ahead, Eve discovers a horrifying version of Charlie standing motionless with closed eyes, tattered clothes, and ants circling her feet. The ants swarm into Charlie's body through her face until Charlie abruptly wakes, recognizes Eve, and says Eve is not supposed to be there yet. Charlie then sees danger behind Eve, panics, and tells Eve to hide because the hospital-gowned woman is almost there. As the decaying woman approaches with a hammer, repeating apologies, Eve runs through the shifting maze, dropping the lantern and leaving fire behind her.

The labyrinth changes from hospital hallway to darker concrete and dirt passages, and Eve finally ducks into a small room and hides inside a wardrobe. Alison enters with the hammer and prowls the room while Eve holds her breath, but when Eve gasps, Alison turns and locks eyes with her instead of attacking. Alison's gaze forces a rush of memories into Eve: Alison's happy childhood in the house, Thomas arriving from the woods, the house and family warping around him, Alison's parents becoming abusive zealots, Thomas being treated as the true child, Alison stabbing him in desperation, and Alison being captured and confined in a psychiatric ward while everyone treated her as delusional. When the vision ends, Eve understands Alison's suffering, and Alison quietly sets down the hammer and leaves.

Later, a man enters the room and turns on the light, revealing a slightly younger Thomas dressed casually and moving through the space as if nothing is wrong. Thomas notices the hammer, seems puzzled about how it got there, then hangs it back on a pegboard among many tools and leaves. When Eve comes out of the wardrobe, the impossible corridors are gone; she is back in the basement hallway she explored earlier, except it is now brightly lit and partway through renovation. Realizing she may have to face whatever is upstairs, Eve takes the hammer and prepares to keep searching for Charlie and Shylo.