Sidney Sheldon's the Silent Widow

A young American au pair, Charlotte Clancy, vanishes without a trace in Mexico City. The case is left cold, but its legacy will be devastating ... A decade later, LA is shaken by a spate of violent murders. Psychologist Nikki Roberts is the common link between the victims, her patients at the heart of this treacherous web. A shadowy manipulator has brought his deadly game to the streets of LA. In a crime spanning generations, it seems Nikki Roberts knows all too much--and a ruthless killer knows the price of her silence. In this crooked city, where enemies and friends are one and the same, Nikki must be the master of her own escape.