After 24 hours on the island each of the four rookie detective teams has a theory of what happened to Charly and who they suspect. Chrissie and Caroline press Tony on just how well he knew the victim, Sarah and Richmond believe Charly was caught up in a love triangle, Rox and Dot investigate what happened after the pub meeting, and Nick and Andrew show they are willing to bend the rules to get a result.

The remaining teams are under increasing pressure to apprehend Charly's murderer. Freddie Forrester reveals that land agent Alicia Devere is not as sweet and innocent as she appears and new forensic evidence also seems to cast further suspicion in Alicia's direction. However, another pair are still doggedly going after their number one suspect, Hamish Gowdie. With two suspects in custody, the net begins to tighten. But the detectives cannot let their guard down as one more team is about to be taken off the case.