From the introduction: You are employed by the Sturdy & Wilde Detective Agency. No case is too small, no victim too grand. When Jonathan Wilde went missing on a case, his partner Barbara Sturdy left to search for him, with only a note on the door that read: Solve the mystery you find on the board. You haven’t heard from either of them since, even though they both took their aether telegraph devices. You are on your own in the dank, dirty city of London