Tragedy turns to terror in Mt. Thomas when a second body is found, killed in a similar manner to the first one, and with a crucifix by the body as before. It appears there is a serial killer in town.

PJ and Amy work with Garth to track down the only man with links to both girls - a masseuse who seems to fit their profile. But, while in questioning, a third victim is found giving the masseuse an alibi.

What confuses the detectives is that the third victim is male which doesn't fit with their established profile of the killer, and it seems they must start at square one.

Meanwhile a recently promoted Senior Constable Susie finds Jonesy is jealous of her promotion, since he too is waiting for one; and Joss and Kelly deal with a child whose dog's burn injuries have aroused suspicion at the local vet.

The third victim of the Mt. Thomas serial killer is a gay teacher named Leon Barclay. PJ and Amy discover a link between him and the second victim - Merinda May: a therapy group for sexual abuse victims, run by Dr. Bill Lapscott a psychologist. What makes them worried about this link is that the first victim did not attend, so Amy infiltrates the group to see if this could be how the victims were chosen.

As the group share stories of their own sexual abuses, Amy gives one also. While she later insists she was making it up, Bill recognises the signs and knows that she wasn't. He invites her out, and begins getting to know her. Garth, however, begins to spect that Bill himself is the killer - a theory that seems cemented when they learn that Bill lived in the same street as Janelle Watts, the first victim.

Amy doesn't believe this theory, so she desperately tries to prove otherwise and ends up suspecting Jeff - Janelle's father - as being the killer.

Meanwhile, Bill asks Amy out and they

The fourth victim of the Mt. Thomas killer has been found in an alleyway near Bill Lapscott's house, using what looks to have been a brick from his yard to knock her out. Confusing the detectives is the fact that a different weapon was used in what seems almost to be a different M.O. The only thing tying her to the other victims is the crucifix, and her history of sexual abuse, leading Garth to suspect there is a copycat killer at work. Amy's theory that Jeff Watts is the killer is proven wrong, since he was under surveillance, but Garth suspects it was Bill. They find him, still at the office, having showered. But there is no evidence to link him to the crimes, since his clothes have no blood on them.

Day Six. Searching Ngaire's house, Garth finds a love letter from her to Bill. He claims that he looked after her one night when she was suicidal and she developed a crush on him, which he did not reciprocate. Recognising Garth's own issues, Bill tells him to go to therapy and Garth gets

The terror in Mt. Thomas reaches climax point as the serial killer strikes out at Amy. She survived one attack, but knows that whoever it is will kill again before the day is through. And PJ, still certain that the killer is Garth, is forced to prove or disprove his case to stop the killer before he kills again...