Luke begins to plan his escape while Sigsby is distracted trying to expose Stackhouse's disloyalty. Meanwhile, Tim loses a friend.

As Luke's tests intensify, a new arrival causes problems for Sigsby; Tim isn't buying the official story about what happened to Annie.

Sigsby tricks Luke into confirming he's TP, forcing him to move up his escape attempt; Tim's suspicions put him on the Institute's radar.

As Tim's investigation pays off in ways he never imagined and Sigsby scrambles to avert disaster, Luke must finally decide who he can trust.

Luke and Tim go on a desperate search for help as Sigsby uses all of her formidable assets in a last-ditch attempt to keep the Institute's secrets.

Our characters come together for a final confrontation with unimaginable consequences.