THE CASE OF THE DECEIVING DON by Carl Brookins (Five Star)

He's ba-ack! Twin Cities detective Sean Sean doesn't have to look for cases. Sometimes they almost literally drop in his lap. Case in point: A senior citizen from the nearby assisted living facility is wheeling about in his motorized wheelchair when he's blown up! Sean feels an obligation to look into his neighbor's death. When he realizes the deceased was actually a mafia don, it's too late to back out of the investigation. Suddenly Sean is having to look over his shoulder as well as into a case. 

Sean Sean has moved into my top ten of fictional detectives.