Someone we know
(Book)

Neighbors begin to turn on each other after a series of break-ins is followed by a murder --,adapted from cover description.

It's a quiet suburb in upstate New York, until anonymous letters start to arrive. "My son broke into your home recently while you were out." Into their homes, and into their computers as well. Learning their secrets, and maybe sharing some of them, too. When a woman down the street is found murdered, the tension reaches the breaking point. Who killed her? Who knows more than they're telling? And how far will all these very nice people go to protect their own secrets? -- adapted from jacket