Synopsis
The letters ''KKK'' scrawled in red ink on the flap of an envelope, just above the gum and five dried orange pips inside mean death to Elias OpenShaw, the recipient.
Other Archive resources

Killing Sherlock: Lucy Worsley on the Case of Conan Doyle | 3: Shadows and Sleuths
After Sherlock’s return from the dead, Doyle became an evangelist for spiritualism. His star declined after a public spat, whereas Sherlock Holmes found a life beyond his author.

Killing Sherlock: Lucy Worsley on the Case of Conan Doyle | 2: Fact and Fiction
Arthur Conan Doyle had managed to finally rid himself of Sherlock Holmes. But who was Arthur without Sherlock, and could he become the hero of his own story?