When 10-year-old Andy Warwick witnesses the murder/suicide of his sister and father, his world is torn apart. Twenty years later, despite his tragic childhood, Andy's a highly respected police negotiator based in North Sydney. He's living a comfortable life, but still suffers from guilt-ridden nightmares from his past and yearns for a family to replace the one he lost.

Sixteen, pregnant and abandoned by those she loved, Cally Savage learned early to fend for herself, but raising a son on her own hasn't come without a price. It's a decade after Jack's birth, but she's struggling to make ends meet, despite taking on a second job as a cleaner at the North Sydney Police Station. On top of her financial woes, her house has recently been burgled and she's terrified the perpetrator might return.

In desperation, Cally turns to the hot-looking detective at the station and seeks Andy's permission to place a roommate wanted advertisement on the noticeboard in the squad room. Attracted to Cally's innocent beauty and intrigued by the vulnerability in her eyes, Andy offers to move in with her. The more he gets to know her, the more he wants to be part of her life. But first, he has to break through the barriers she's erected around her heart.

Just when things appear to be on track, the man who believed for more than 10 years that his child had been aborted discovers Cally's deceit. Enraged, he vows not to give up until he's found his son and punished the woman who lied to him.