Sixteen‑year‑old Alyson Rogers thinks her biggest problems are oversleeping, sprinting to school, and rereading The Hound of the Baskervilles way too many times. But when her ordinary day takes an impossible turn, Alyson finds herself face‑to‑face with the one person she never expected to meet outside the pages of a book: Sherlock Holmes: very real, very smart, very confused, and very much not from this century.