The three police officers who head up Castlemere's detecting team work together like the parts of a well-oiled machine. Detective Superintendent Frank Shapiro is a thirty-year man who has finally found a detective inspector with the instincts and discipline to complement his experience - Liz Graham. Liz, the first female detective on the force, is now one of its most respected senior officers. Her detective sergeant, the volatile Cal Donovan, possesses a reckless courage that is his greatest strength and his most dangerous weakness - and something Liz finds as indispensable as it is infuriating. A vicious gang of thieves has hit the city, and the easiest way to snag them is to infiltrate their organization. Can Donovan pull off the assignment without losing his cover - or his life? Liz goes undercover in a different way when she decides to act as bait for a baffling serial rape case, but is the department - and her marriage - strong enough to handle the results?