Spoiler for anyone who’s been living on the Planet Zog:

“The Adventure of the Speckled Band is a classic Sherlock Holmes short story by Sir Arthur Conan Doyle, first published in 1892, featuring Helen Stoner seeking Holmes’s help after her twin sister’s mysterious death, which she fears is about to be repeated as she hears a whistle and sees a “speckled band” in her room at their stepfather’s manor, Stoke Moran, leading Holmes to uncover a murder plot involving a venomous snake. It’s a famous locked-room mystery, considered by Doyle to be his best story, and involves themes of greed, inheritance, and Gothic horror.”