Trouble Maker by Janet Evanovich and Alex Evanovich

Troublemaker Book 1: Alex Barnaby Series 3 - Book 1 begins with Alex Barnaby finding a voodoo doll at her friend Rosa’s desk.  Rosa has been kidnapped; a note left for her boss, Walter Percy, to say that he has 2 days.  Percy isn’t around so Alex and Sam Hooker need to find out what the kidnapper wants as well as Rosa.