Someone at the Door — Caroline Crane

Gwen Faris has a handsome husband, a three-year-old autistic son, and an attractive home in suburban Long Island. And she has a new baby on the way. Why then, after phoning her sister Cathleen that the baby was coming, did she disappear? When Cathleen arrives to care for little Derek, she finds the front door open and Derek alone. And Gwen, who had said she was in labor, has not called her doctor nor checked into a hospital. The search for her leads nowhere. Even the police are unconvinced that Gwen did not simply walk away. The only clue they have are Gwen's last words to Cathleen: There's someone at the door. Who was that someone? The only person in the house at the time was little Derek. But he is mute, locked in a world of his own. Here is a story about a terrifying secret, a tense novel that builds to a shocking climax.