Lightkeeper's Curse by Cassie Miles

With the darkness closing in around them they’ll risk everything to bring a killer to light.

Rookie FBI agent Skylar Gambel and police detective Jake Armstrong both had their lives shaped by the Lightkeeper Murders. Now, twenty years later, a new serial killer called the Shadowkeeper has emerged from foggy obscurity. Are the deaths the work of a new murderer, simply an evolved one…or a curse? Skylar is determined to crack the case, even as she fights her hidden phobias and her attraction to Jake. But when she is kidnapped along with the killer’s next victim, Jake vows to silence the violent slayer once and for all.