Ghostly echoes

Jenny Cavanaugh, the ghostly landlord of 826 Augur Lane, has enlisted the services of her detective-agency tenants to solve a decade-old murder--her own. Abigail Rook and her eccentric employer, R. F. Jackaby, dive into the cold case, starting with a search for Jenny's fianc , who went missing the night she died. But when a new, gruesome murder closely mirrors the events of ten years prior, Abigail and Jackaby realize that Jenny's case isn't so cold after all, and her killer may be far more dangerous than they suspected.