Detective Kara Quinn is on an early morning jog in Liberty Lake when she discovers the body of a young nurse. The manner of death reveals a highly controlled rage.

Word quickly reaches FBI special agent Matt Costa that this murder fits the profile of the elusive Triple Killer, who compulsively strikes every three years, targeting three victims, each three days apart. This time they have a chance to stop him. But only if they can decipher the meaning of his pattern to figure out who he is and where he is hiding before he strikes again.