Detective Chief Inspector Alan Banks must face his most challenging and personal case yet. A distraught woman has found a loaded gun hidden in the bedroom of her daughter, Erin-- a punishable offense under English law. When an armed response team breaks into the house to retrieve the weapon, events quickly spiral out of control. Trouble is only beginning, for it turns out that Erin's best friend and roommate is none other than Tracy Banks, the DCI's daughter. Now, Annie and Banks must risk everything to outsmart a smooth and devious psychopath but for Banks, it's not just his career hanging in the balance, it's also his daughter's life