Jill Parrish is trying to rebuild her life after surviving a terrifying kidnapping attempt. Though she is having a difficult time, she takes small steps toward normalcy by starting a new job and inviting her sister, Molly, to move in with her. Returning home from work one morning, Jill discovers that Molly has vanished, and she is certain that the same man who previously abducted her has returned for revenge.

From murder and espionage to terrorism and stolen submarines, a team of special agents investigates any crime that has a shred of evidence connected to Navy and Marine Corps personnel, regardless of rank or position.