The Goodsister

A killer who calls himself “Angel” torments his teenage targets through the clever use of social media in this disturbing thriller from bestseller Staub (Nightwatcher). Angel becomes part of their online lives while their parents remain unaware of his presence. Buffalo, N.Y., mother Jen Archer notices that her 15-year-old daughter, Carley, isn’t her usual self, but it’s only when Carley’s once inseparable friend, Nicki Olivera, becomes an apparent suicide that Jen begins to realize that something serious is going on. Angel takes us further into his horrifying world as Jen and her husband move through their daily lives. The pace is slow, but this is Angel’s story, and it leads to a surprising and terrifying conclusion as Jen sees the connection with a tragedy from her own teenage years. You will want to monitor your children’s Internet “friends” after reading this one—and you just may start looking back over your own shoulder. Agent: Laura Blake Peterson, Curtis Brown. (Oct.)