Sergeant Lindsay Boxer´s friend and former partner is brutally murdered in San Francisco´s Golden Gate Park. SFPD homicide detective Lindsay Boxer knows her way around a crime scene. But nothing can prepare her for the shock of recognition: the victim is Warren Jacobi, Lindsay´s onetime partner who rose to chief of police. A top investigator until the end, Jacobi managed to leave Lindsay a clue. Following a trail of evidence along the west coast, the Women´s Murder Club pledges to avenge Jacobi´s death before the killer can take another one of their own.