Murdered son of Dr. Elias Cartwright
A tall man in a dark suit and bowler hat carrying a briefcase. He has glasses, a handle-bar moustache, and looks to be in his thirties. His manner is supercilious, but he seemed anxious or nervous.
Horatio was brutally murdered on the Henley-on-Thames train by the blind man on the morning of the 2nd of June.