Sherlock Holmes thrives on danger. Sudden knife attacks, being stalked, and facing a network of assassins present little more than a cheery break in the monotony. But the enigmatic Lady Beatrice presents danger of a different kind. Is she a murderer or a potential victim? Or something even more perilous? Uncovering her secrets could change Holmes's life forever, and in ways even he cannot anticipate. The newly-discovered Holmes diaries shed light on a tale so potent, Watson was never permitted to reveal it.