April 18, 1887: Action’s house in Reigate was broken into (REIG)
April 18, 1887: Holmes and Watson arrived home from Lyons (REIG)
April 18, 1888: The Baker Street Irregulars started their search for the launch Aurora (SIGN)
April 18, 1897: Dr. Leon Sterndale murdered Mortimer Tregennis (DEVI)