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 across the country, the Women's Murder Club pledges to avenge Jacobi's death before the killer can take another one of their own.