Detective Sergeant Mackenzie McAllister leads a team of police investigators. When the new kid, Drew Bradley, joins the squad Mack is bound by duty to show him the ropes. The chemistry between them is immediate, but with Mack being twelve years older, she fights becoming entangled with the young sexy detective. Drew enters the unit, not only to help with the investigation they are conducting, but to find out what is really going on inside the walls of the unit. Working with the intense and strict Sergeant Mack is invigorating, but between the need to protect her and his second shield, he is at a loss and falling hard. Together they will uncover the evil from within, and try to deny the passions that rage between them. Who in her unit is trying to keep her from finding out the truth? Who will take a life that will draw them closer? And what are the secrets hidden behind the shield?