25 Alive by James Patterson

The twenty-fifth thrilling novel in the globally bestselling Women's Murder Club series. 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 former partner who rose to chief of police. A top detective 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. __