<p><strong>The darker side of Sherlock Holmes and the romantic side of Doctor Watson are both revealed in this enthralling second novel in Arthur Conan Doyle's detective series.</strong></p>

<p>Thick fog swirls through London, winding its way down Baker Street towards flat 221B where a cocaine-dazed Sherlock Holmes sits awaiting a new case. When a beautiful young woman, Mary Morstan, presents the sleuthing duo with two seemingly unrelated cases, all three work together to solve a decade-long mystery.</p>

<p>A tangled web of missing fathers, curious deaths, and cursed treasure, <em>The Sign of the Four</em> was first published in 1890. This edition features a specially commissioned introduction alongside an article by Arthur Conan Doyle and an essay on the history of detective fiction by S.S. Van Dine.</p>