The Couple Next Door by Sheri Lapeña (2016)

Anne and Marco Conti leave their newborn baby at home alone and go to a party at the neighbor’s house. Despite them checking on the baby every half hour, the baby is missing when they get home.

Sheri Lapeña’s The Couple Next Door is a gripping, can’t-put-down tale of deception, betrayal, and unfaithfulness that will keep you in suspense until the final twist.