Deadlock By Sara Paretsky

'Who're you working for then, Warshawski?' 'My cousin.' 'Boom Boom? He's dead.

 I know. That's why I'm working for him.' Boom Boom's body was found floating near the docks, chewed up and spat out by a ship's propeller. More like brother and sister than cousins, Vic and Boom Boom looked out for each other.

Boom Boom grew up to be an ice hockey hero, and Vic a private eye. And now V I Warshawski would like to know how, exactly, her cousin died . . .