In which I leave undone what I ought to have done, and do what I ought not to have done

A Sherlock Holmes mystery set in Victorian Hogwarts and London. A valuable artefact has been stolen from Hogwarts, and the only suspect - a Muggleborn pupil - has disappeared. Headmaster Phineas Nigellus Black summons Holmes to Hogwarts to retrieve the Ravenclaw Codex, but things are not as simple as they seem, and Holmes and Watson soon find themselves in the middle of a most perplexing case.

Do you think this will fly?

( Sherlock Holmes and the Ravenclaw Codex - Chapter One: The Red-Headed Man )