Imagine a serial killer who has already struck a horrific number of times. A killer who discovers people's secrets – the deepest, darkest secrets we keep even from ourselves – and uses them to target and destroy his victims. The case begins with a shock, and the twists keep coming, when FBI Special Agent Smoky Barrett and her team investigate a murder brazenly committed on a flight from Texas to Virginia. Who will the next victim be? Everyone in the world has secrets. Even Smoky.