L.A.Requiem by Robert Crais

Crais's wise-cracking LA private eye Elvis Cole is one of the most appealing heroes in the genre. In this, his eighth outing, Elvis is torn between loyalty to his best friend and partner, ex-cop Joe Pike, and the need to solve the murder of a young woman, Pike's ex-girlfriend and the daughter of a powerful and rich man. But as the investigation continues the finger of suspicion points more and more at Pike himself.