A serial killer is on the loose in California, leaving letters carved into the torsos of his victims. When Daisy Dawson fights off a masked attacker one night, she grabs a necklace from around his neck. What she doesn't know then is that she's found the missing link to a cold case that Special Agent Gideon Reynolds has been tracking for seventeen years. With Daisy's help, he finally has the opportunity to get closer to the truth than ever before. But it soon becomes clear that Daisy's attack was just the beginning. Now the bloodied bodies of young women are showing up all over the state. As Gideon tries to track down the killer, it's clear he has a new target. Daisy is in more danger than they ever could have realised.