The adventure of the yellow paper -- The affair of the chronic argonaut.
Summary
"A rash of gruesome cannibal murders surrounding the construction of the London Underground draw Sherlock Holmes and Dr. Watson into a bizarre case in which reality changes without warning... In a second mystery, Holmes encounters a dead man in a locked room, and the only clue is a crushed piece of yellow paper. Holmes and Watson follow a twisted path of murder and political intrigue that threatens to topple an empire and leave them dead in the process." -- Back cover.