The Hermit of ---- Street - Anna Katharine Green

Delight Hunter spends her days looking out of her window at her handsome but very mysterious and reclusive next door neighbor. She walks straight into a mystery when one day a fire starts in one of the upper rooms of his house and she dashes over to warn him, only to have him lock her in with instructions to let no one else in. Why is he so insistent that no one come in? What secrets are hidden within the walls of this house? - Summary by Laura Victoria