Guido's undercover past threatens his job at Southwest 101 when he becomes the prime suspect in the murder of Vincent Rinaldi, a crime figure Guido was involved with while working undercover and whose $2 million he is now being accused of stealing. As his colleagues' trust in him is put to the test, Guido's sole focus is on locating a missing 18-year-old girl, leaving him at risk of sacrificing everything for a girl he has never even met.

The detectives spend a night on the streets against a backdrop of simmering tensions, while Cameron plumbs the depths of her own soul to connect with a killer.

A reporter's interest in a fatal hostel arson case in which an alleged police cover-up sent the wrong man to prison prompts Kostas to put the Eddie and Donna on the reopened case. When Guido learns the target of their investigation he is forced to confront the truth about his legendary detective father and the role he played in the conviction.

Eddie's faith and his friendship with Father Paul Moran are tested when Irena's sister goes missing and foul play is suspected.

Donna and lawyer flatmate Madeleine Delaney are in ethical conflict as they fight to save a woman charged with murder for preventing rape.

The report of a suspicious death at a nursing home brings Eddie back into contact with a former neighbour who helped him after the death of his father. Cameron must also confront her past when her former bestfriend asks her for help to keep her arrest for shoplifting quiet in hopes of preventing her fiancé (Cameron's ex-boyfriend of three years) from finding out. Donna must decide if she should tell Eddie about Madeleine's relationship with Rob.

Cameron is torn between Guido and his father, Senior Detective Bill Martin, and she soon finds her integrity and a boy's life are in the line.

Guido's Naval Captain brother, the favoured older son, returns home a hero, and tensions between the brothers surface as a female naval officer is found murdered. Cameron again finds herself working alongside Bill Martin to rein in a Chinese gang leader.

Guido and Cameron each face a personal crisis—and their friendship is tested—as Guido's father and brother come under suspicion.

Eddie's integrity is tested as the father of Irene's son is released from prison. Eddie wants to reunite the boy with his father—but could lose Irene.

Guido's friends rally to his side as his father faces a terminal illness—and a murder charge.

Guido and The investigation into the suicide of an olympic swimming hopeful escalates when those around the investigation begin to be killed off. Cameron deal with an armed robbery involved the son of a prominent QC. Eddie declares his love for Irene—but it may be too late. She has stepped into the path of a killer.

With Irena's condition uncertain, the search for the serial killer continues. Guido is forced to make a decision about his future with Sophie when Kostas gives him an ultimatum. Donna life is put on the line when she becomes involved in a hostage situation.