I thought this was a very well written Sherlock Holmes pastiche. I was a little put out at first by the thought that it was written by a Unitarian Church minister, thinking that it would be preachy and have a sentimental Holmes pondering his religious beliefs. But that ended up not being the case at all.
Representatives of the world's religions are drawn together for a conference when one of the hosts is found murdered. In a closed conference, only one of the attendees could be guilty. Due to political ramifications, Mycroft Holmes calls for the aid of Sherlock Holmes and Dr Watson in solving this case and keeping it hush-hush. A young Father Brown is in attendance at the conference as a translator for the representative of the Vatican. The game is afoot!