Who Killed Merlin the Great?

Merlin the Great's famous escape-from-a-coffin trick backfires when it is discovered that he has been shot while ""buried"" in a hotel pool - but how was it done? and which of the rival magicians has a deadly trick up their sleeve? The only clues are a feather found on the body and the grave of someone named ""Miriam"". Whodunit? Was it the lovely magician's assistant, the escape artist, the fortune teller, the hotel doctor, the ventriloquist or the knife thrower? A phony seance exposes the real culprit.