On a mission to find food and water, Harriet and Douglas discover a dinghy capable of ferrying just two people. The duo selfishly conspire to leave the island and return for the others later. In an attempt to pacify an emotionally distraught Susan however, Douglas reveals the secret escape plan promising her a place aboard the vessel. The dinghy double-crossing begins to spiral out of control, leaving Douglas in a state of turmoil and Brett paranoid that machinations are afoot. (thetvdb.com)