Deadlock: V.I. Warshawski 2 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 . . .