Monkey Man (The Bubba Mabry series Book 7)

Private eye Bubba Mabry's meeting with a new client seems to be going well until the monkey with the gun shows up. Now Bubba's facing an uncooperative police force, a barrel full of suspects, and an intern who drives everyone bananas. And he's got to figure out which of the animals at the Albuquerque zoo really belong behind bars--before another one winds up in the morgue.

From Booklist
The seventh Bubba Mabry mystery begins with a bang: Albuquerque PI Bubba is enjoying a chat with a potential client when a guy in an ape suit walks into the cafe and pulls out a gun; suddenly, Bubba has blood all over him (not his, but still . . .). Soon he's juggling a grieving fiancee, a snoopy reporter (who also happens to be Bubba's wife), a hypereager intern (named, appropriately enough, Keen), and a suspiciously high death rate at the local zoo. This series offers a nice mix of low-rent comedy, solid action, and general amiability.