Purgatory

Chris and Adam come clean as to their involvement in Alex's death. After much deliberation, the group decides to wait to confront Bobby, but Jessica has ideas of her own. After finding a letter tucked into her book, Marie disappears.

Upon finding a note left by Marie, Chris is shocked by what he reads. Jessica and Nora locate Bobby and beg him for medication for Ivan. Due to a lack of progress in their search, hope begins to dwindle for the parents of the trapped.

Suspicious of Ivan's disappearances, some begin to believe that he is the one responsible for their predicament. Jessica's grip on reality loosens. Lisa takes desperate action to escape from Bobby. Emma discloses a secret to Jessica.

A press conference held by Preston is seen by Shambala's kitchen crew. Devastated after losing Ivan, Nora sacrifices her dignity for food. Jessica drifts in and out of mania. Vivian's illness compounds her family's suffering.

Lisa tries to escape from Bobby's grip. Whilst Preston is left to confront his new reality, the Inspectors follow the trail of witnesses. Meanwhile, Chris and the others deal with Jessica, before going after Bobby.

Emma discloses a regret to Chris. Luke believes Bobby is behind the group's predicament. Lisa reaches the frayed ends of sanity with Bobby. Jessica snaps out of her psychosis in an unexpected fashion. Above ground, things get complicated.

Ophelia and Ryan receive intel suggesting a potential location of Shambala. Preston believes he knows who is behind the kidnapping of their children. Jessica truly believes she saw Dmitri shoot Bobby. Chris makes a startling discovery.

The authorities find more than they bargained for at Shambala. What fate awaits the remaining victims below ground now that the mastermind behind their captivity has stepped into the light?