Erica Spindler 
Shocking Pink 

Three women haunted by an erotic crime they witnessed as teens are stalked by a murderer in this thriller from a New York Times-bestselling author.They were only watching The mysterious lovers the three girls spied on were engaged in a deadly sexual game no one else was supposed to know about. Especially not Andie and her friends, whose curiosity had deepened into a dangerous obsession. . . .Now, fifteen years later, someone is watching Andie. Someone who won’t let her forget the unsolved murder of "Mrs. X" or the disappearance of "Mr. X." Suddenly Andie doesn’t know who her friends are . . . because loyalty can be murder.Andie. Julie. Raven.Three very different women bound by more than friendship."Ingenious twists and turns in a story that features friendship, obsession . . . and murder will long be remembered by this reviewer." -The Mystery Reader