Fifth Grave Past the Light

This paranormal book follows Charley Davidson, a private eye and grim reaper extraordinaire. Things get complicated when Reyes Farrow, the son of Satan, moves in next door and becomes her main suspect in an arson case. Dead women start appearing in her apartment, and her sister becomes the serial killer's next target. Charley has to ask for Reyes's help, but he wants her in return. Will she sacrifice herself to keep her sister safe?