S1, E4: Cormack investigates the link between Ezekiel's missing cousins-"the lost boys"-and Isabel's murder. He probes Joe about his connection to Ezekiel, but Joe refuses to cooperate. Billy Hopkins claims to have evidence implicating Steve Walcott in the crime, and he tries to blackmail Chloe and Steve with it. The Walcotts dismiss him, so Billy arranges to meet Cormack to share his evidence.