The CBI team investigates the roadside murder of a lawyer, Gordon Hodge, whose only client is one of California's most powerful and notorious motorcycle gangs, the Sinner Saints. Gordon was not an upstanding citizen: he was caught carrying drugs and had had an affair with Constance, the gang leader Von McBride's girlfriend. The team discovers suspects aplenty: Von McBride, Constance, Gordon's wife who knew of the affair, Gordon's son who hated his father, and Felicia Guthrie who seeks revenge as McBride had killed her brother but Gordon had got him acquitted.