When the mutilated body of a young boy is pulled from the river, Leo is determined to give him an identity and to bring his killers to justice.

The episode was rated 7.21 from 123 votes.

Leo is concerned that the police are involved with a cover-up to protect a rogue undercover cop linked to the death of a young woman.

The episode was rated 7.21 from 115 votes.

The team investigate a man who died on a night bus, an office prank gone tragically wrong and the suicide of a pro footballer.

The episode was rated 7.20 from 133 votes.

Tragedy strikes after a student asks Sam for advice over her arranged marriage, and then sees her family torn apart.

The episode was rated 7.19 from 178 votes.

Memories of his own daughter's death are stirred up when Leo is called in to investigate the apparent suicide of a teenage girl.

The episode was rated 7.18 from 125 votes.

Harry is drawn into the murder of a Hasidic man found on disused wasteland, while Leo investigates the death of an Australian backpacker.

The episode was rated 7.17 from 110 votes.

When a third killing takes place on school grounds, Leo races to find some connection between the apparently motiveless murders.

The episode was rated 7.17 from 113 votes.

Harry and Nikki's friendship is rocked by the discovery of the body of Harry's ex-lover.

The episode was rated 7.17 from 131 votes.

Leo refuses to back down in his search for the killers of the young boy, despite threats and increasing racial tension.

The episode was rated 7.14 from 106 votes.

Sam challenges the police after an indepenedent postmortem into McNally's apparent suicide. Further deaths take place.

The episode was rated 7.14 from 93 votes.