Having emerged from a Swiss glacier and solved his first murder case in more than ninety years (described in The Strange Return of Sherlock Holmes), the world’s most famous detective now sleuths through modern London in search of a stolen letter purportedly written by Shakespeare. Holmes displays his usual mental brilliance as he investigates the missing letter and discovers an international plot to arm terrorists. He and his roommate, James Wilson, track the Shakespeare letter and the terrorist arms dealers to a Scottish castle where surprises await . . . and where the two companions quickly find they must be bloody, bold, and resolute if they are to survive.