Someone We Know by Shari Lapena, Fiction, Mystery

"In a quiet, leafy suburb in upstate New York, a teenager has been sneaking into houses—and into the owners' computers as well—learning their secrets, and maybe sharing some of them, too. Who is he, and what might he have uncovered? After two anonymous letters are received, whispers start to circulate, and suspicion mounts. And 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? In this neighbourhood, it's not just the husbands and wives who play games. Here, everyone in the family has something to hide."