Years after their parents' murder, identical twin brothers, determined to clear one name at the expense of the other, ask Laura Moran and her Under Suspicion crew to solve this brutal crime and as they get close to the truth, they find the danger from the past finding its way into the present.

Rebel surfer-turned-field ops specialist Sydney finds herself in hot water while undercover on a marine research vessel, while her City Spies teammates investigate a suspected mole.