The other one

In this intricate whodunit from New York Times bestselling author Mary Kubica, the protagonist is drawn into a mysterious web of secrets.
Sadie and Will Foust have just moved their family from bustling Chicago to a coastal island in Maine when their neighbor Morgan Baines is found dead in her home. The murder shakes the whole island, but no one is more shaken than Sadie.
But it's not just Morgan's death that makes Sadie nervous. And as the eyes of suspicious citizens turn to the newly arrived family, Sadie is drawn deeper and deeper into the mystery of what really happened that dark, deadly night. But she has to be very careful, because the more she finds out about Mrs. Baines, the more she begins to realize how much she has to lose if the truth ever comes out.