Tess is delighted when her sister Bridie turns up in town with a good job and a new boyfriend, but Jonesy has to work hard to overcome an instinctive dislike. The Heelers are baffled when a man confesses to murdering a young woman, but they can't find her body. Bridie flirts with Jonesy, causing escalating aggression from the boyfriend, who takes it out on Bridie, then staggers into the hospital with a stab wound. Meanwhile the young woman is found, but says she's been raped. When the Heelers go to question the boyfriend and the young woman, they discover both have disappeared from the hospital—along with Jonesy, who was supposed to be guarding them. And then an hysterical Bridie leads them to her boyfriend's bloody dead body.

Bridie accuses Jonesy of murder, but makes the mistake of manufacturing evidence against him. When she is found out, suspicion naturally falls on her, and she is arrested. But Tess is convinced of her innocence, and persuades a rather reluctant Jonesy to help her find the real killer. Ironically Tess' efforts to exonerate her sister of murder reveal that she is involved in a far more despicable crime—she has been running a brothel staffed by sex-slaves. Tess is forced to make an emotional choice, finally accepting her sister for who she really is.