England, 1976. Mrs. Creasy is missing and the Avenue is alive with whispers.?Ten-year-olds Grace and Tilly decide to take matters into their own hands. Spunky, spirited Grace and quiet, thoughtful Tilly go door to door in search of clues. The cul-de-sac starts to give up its secrets, and the amateur detectives uncover a complicated history of deception?everyone on the Avenue has something to hide. As the lives of all the neighbors begin to unravel, the girls come to realize that the lies told to conceal what happened one fateful day about a decade ago are the same ones Mrs. Creasy was starting to peel back just before she disappeared.