Plum Spooky by Janet Evanovich

Plum Spooky - Diesel pops into Stephanie’s life, this time after Wulf Grimoire, who kills and leaves his mark seared into his victim’s skin. Wulf has teamed up with Martin Munch, a nerd, who can’t get a girl and wants Stephanie. Munch happens to be on Stephanie’s list of FTA’s. In the midst of all this are monkey’s who have been used in some weird experiment and now have metal caps on their heads.