Purgatory

The stark reality of being trapped in the underground tunnel system tests everyone's resolve until Dmitri discovers a shrine dedicated to a man a few in the group are acquainted with, compelling everyone to question Chris and Marie.

Nick questions Emma's role in the group's setup. Ivan reveals a shocking secret. Jessica's mother receives a strange text, while Chris' father receives a threatening phone call. Nick and Bobby discover someone in the cave has a gun.

Two groups split up to find the source of the gunshots. Upon finding Nick accusations fly as to who may be the murderer. Dmitri raises the possibility of others being in the cave. A search yields no results. Is the killer in the group?

Ophelia and Preston initiate a search for their children. Bobby awakens with a gun lying beside him. Using the weapon as leverage, and feeling framed, Bobby confronts the group and reveals a secret. Lisa discovers her connection to Alex.

Lisa persuades Kat to find Bobby, and soon they find a cache of supplies. Kat learns how she is linked to Alex's death. Emma reveals a big secret to Dmitri. Preston's investigation makes a breakthrough in tracking Chris.

Kat's health goes downhill. Ivan volunteers to reason with Bobby, otherwise Chris and Adam have other plans. Doubt enters Marie's mind as to Chris' culpability in Alex's death. Ophelia uses the media to strengthen her search.

Emma divulges what she knows about Chris and his involvement in Alex's death, further fracturing the group, and causing a rift to form between Marie and Chris. Lisa's time with Bobby goes from bad to ugly. Ophelia and Preston join forces.