Simply Criminal 
Book One from the Case Files of Ned Nbonivoy, Private Eye 

Ned Nbonivoy hates guns, violence, and the mob. By keeping a low-profile, his life and career as a private investigator working the streets of Detroit is fairly safe and manageable...until he falls in love with the mistress of the city's biggest crime boss. Now, resorting to guns and violence may just be his only option if he wants to stay alive.