While BBA and the others converge on the clinic, Nina persuades Hap to show her his research, and Karim unlocks one of the house's final secrets.

While Hap zeroes in on a new test subject in Cuba, Homer and OA work to perfect their escape plan. Scott reaches his breaking point.

Karim visits Nina at the clinic for help finding the secret entrance to the house. Meanwhile, Hap meets a fellow traveler, and Homer goes on a date.

While private eye Karim Washington scours San Francisco for a missing teen who was involved in a cryptic game, OA wakes up in unfamiliar surroundings.

After a harrowing ordeal, OA and Karim find themselves locked inside a labyrinth of puzzles. Nagging doubts prompt Homer to snoop on Dr. Percy.

As BBA and the kids head west, an alarming news report forces them to speed up their plans. Jesse wrestles with lingering trauma from the shooting.

An ominous new dream and a tense outing with Nancy and Abel take a toll on OA. Steve finds his life in turmoil once again.

In Michigan, Steve begs the gang to try jumping to another dimension, and a presence in Buck's mirror inspires an unlikely pilgrimage.

A woman missing for seven years turns up at a hospital with strange scars on her back but can't -- or won't -- reveal where she's been.

As the group continues its search for the final movement, a startling turn of events gives Hap's work a new urgency.