Free Fall by Robert Crais

Five minutes after his new client leaves his office, Elvis and his partner, the enigmatic Joe Pike, are hip-deep in a deadly situation
as they plummet into a world of South Central gangs, corrupt cops, and conspiracies of silence. And before the case is through, every
cop in the LAPD will be gunning for a pair of escaped armed-and-dangerous killers - Elvis Cole and Joe Pike.