A deserted island.

A secret training ground.

And a murderer on the loose.

Sarah Sullivan was just six years old when her parents were killed in front of her. Ever since that day, all she's ever wanted to do is to stop others from experiencing the same devastation. And now, twenty years later, she's just days away from realizing her dream of becoming a detective.

Then, in a heartbeat, her hopes are ripped away. Bound and blindfolded. Pitted against the ex-boyfriend who disappeared without a trace. Sarah must make a difficult choice.

Her captors say they can help her find her parents' killer. They say their cause is noble and just. And Sarah wants to believe them. But then comes the first body...