Books in the Donatti's Lunatics series

When a team of ghost hunters goes rogue, Olivia Stone, rookie federal agent, is dispatched to investigate. What starts off as a simple assignment quickly turns into a job from hell. Literally. Not only does Olivia join the ghost hunters in a battle against murderous demons, she also falls hard for James Donatti, the team's enigmatic leader who makes it clear he wants nothing to do with her. As the investigation unfolds, Olivia and James are drawn together by an inexplicable force, but will their romance survive what's in store for them?