All three Sue Denver, Werewolf P.I. books are available in audiobook format at these retailers:
The three books are narrated by the wonderful April Doty and include: 

Sara takes on her first client as a new P.I.

Sara adds team members in her search for a missing woman
and her fight against an evil billionaire

An 11-year-old murder, a missing daughter, and a
werewolf running loose in Yellowstone Park