Natalie Pierce's suicide leads the detectives on a mission to discover the connection between her and 7 house fires in 9 years all resulting in the deaths of children.

The detectives continue to work on the case, will they find all the clues before another tragedy happens?

Jim Conway is returning to Australia to face charges for the murder of Suzanne Fendleton he asks Matt to deliver his mother a letter and when they are taking him to the station he throws himself in front of a lorry, killing himself. Matt delivers the letter and receives evidence that just may prove that Jim was innocent.

A sporting reunion of the University Eleven results in tragedy when they end up one man down, leaving Homicide to investigate the crime. But does the murderer have more killings planned?

Terry Jarvis does his utmost to get rid of Duncan from the homicide team as the rest of the team try to solve the death of an Iraqi boy apparently killed in a police pursuit.