To Die in Beverly Hills — Gerald Petievich

Treasury Agents Charlie Carr and Jack Kelly, investigating a counterfeiting ring, are tipped off by Det Travis Bailey of the LA police a cool, ruthless cop with some strange tastes in sex and women who warns them of a plot to murder their prime witness.
They become involved in a phony stake out and Kelly is seriously wounded. Deeply suspicious, Carr is determined to avenge his partner's murder.