When the main suspect goes missing, Lisa is concerned about Sean's possible involvement. The discovery of a key piece of evidence provokes a number of new theories and the police begin to look more closely at other members of the Meredith family. Abbie falls deeper into Vincent's world, bringing Sam with her. Meanwhile, Sean's vigilante justice leads him down a dangerous path.

A confession to Lisa shines a possible new light on Dylan's killer. Abbie has a terrifying experience with some local junkies and Rob's escalating actions begin to impact on his family. Med starts to suspect Lisa is hiding something from him and begins to make his own investigations.