Joyce and Ava are tackling the final great Sherlock Holmes novel, The Valley of Fear, which features a terrifying cipher, a country-house murder, and a chilling American secret society. The hosts explore the dual nature of the mystery, which forces Holmes to solve a case rooted in both the present events and a violent past. They discuss how Sir Arthur Conan Doyle uses this divided narrative to examine themes of hidden identities and the long shadow of secret violence.