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"Teenager Olivia Danvers knows that the previous residents at 16 Olcott Place moved out in the middle of the night, but nobody really knows why; the new family, the Donahues, have three children including a daughter, Janie, Olivia's age, and the two become close friends--but when the threatening letters start arriving from the 'Sentry of Glennon Heights' the two girls realize that the house and town are hiding sinister secrets, which could tear their whole world apart"--Provided by publisher.

Emotionally crippled by his obsessive-compulsive disorder, teenager Matthew Corbin rarely leaves his room on a cul-de-sac in London, and he passes the day observing and writing down his neighbors doings from his window--but when a toddler staying next door disappears Matt is the key to solving a mystery and possibly saving a child's life .