Our Young Lions are still idealistic, even heroic. There is nothing world-weary or cynical about them. They want their lives to mean something: they want to make a difference. That's why Donna Parry's headed for the big smoke. But her first day as a city cop is more than she'd counted on when the police station is rocked to its foundations by a convicted cop-killer determined to exact his own vengeance.

Guido Martin wants two things in his life—his job and the woman he loves. He can't have both. And the job is setting him on a collision course with Eddie Mercia whom he accuses of beng involved in a cover-up. Donna and Cameron investigate a series of convenience store robberies committed by two transsexuals.

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.

Cameron feels that a girl found dead in a hotel penthouse is treated like party debris both by the elite partygoers and some investigators. Paul Bergin asks Guido's father for help to bring down a Chinese gang boss.

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

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.