The 6th Target ~ James Patterson

A TERRIFYING ATTACKER
A burst of gunfire leaves several people dead–and one woman fighting for her life. That victim is a member of the Women's Murder Club, four friends who join forces on their toughest cases. Detective Lindsay Boxer pursues one lead after another to capture the man who tried to kill her friend…but the clues don't seem to make sense.

CHILDREN ARE VANISHING
While Assistant District Attorney Yuki Castellano prepares to prosecute a high-profile trial, the city suffers from a chilling crime spree. Children of wealthy families are being abducted–along with their nannies. Yet the kidnappers are silent and do not demand a ransom. Parents everywhere fear the worst. Now with the entire city gripped in fear, Lindsay must frantically work with her new partner to connect these horrific crimes.

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Another great James Patterson novel and as with most all his novels couldn't put it down.