On April 18th…

April 18th 1888
The Baker Street Irregulars started their search for the Launch Aurora. (SIGN)

April 18th 1887
The Acton House was broken into. (REIG)
Holmes and Watson arrived in Baker Street from Lyons.

April 18th 1897
Dr. Sterndale murders Mortimer Tregennis. ( DEVI)