Recently Edward Steinhart has discussed the assassination of the British colonial officer Harry St. G. Galt in Uganda in 1905. Steinhart's account is based almost entirely on the Entebbe Secretariat Archives and on interviews he conducted. It focuses on the political intrigue brought to light by the murder enquiry, but much of the interest derives from the mystery surrounding Galt's death. In our opinion, Steinhart comes very close to the truth when he writes of his discovery that a conclave of chiefs had been held on the night of the murder, and he begins to suspect that Kahaya, ruler of Ankole, as well as Igumira, a reactionary chief, were involved in a plot which was somehow intended to discredit Nuwa Mbaguta, enganzi (Prime Minister) of Ankole, and Igumira's rival. Steinhart is then deflected because he thinks that the evidence for a conspiracy rests only on this event, and on statements from Sir Charles Gasyonga, Kahaya's successor. We think we can come much closer to a solution to this mystery by using archival material which has hitherto escaped notice. The Diary of the White Fathers Mission at Mbarara, the capital of Ankole, refers to the events of this year, and for the first time offers a plausible motive for the assassination. The White Fathers Archives in Rome have been open to scholars for some years, but it seems that not all researchers are aware of the wealth of material which they contain. Mission archives assume particular importance in the case of Uganda, which is now virtually closed to research, and we will try to illustrate their value by reference to this incident.