A mysterious Catholic priest arrives at 221B Baker Street, only to utter the words “il corpe” before dropping dead.
Though the man’s death is attributed to cholera, when news of a similar case in Bristol reaches Holmes, he becomes convinced that the priests have been poisoned.
He and Watson learn that the men were on a mission from the Vatican to investigate a miracle; it is said that the body of an eighteenth-century philanthropist and slave trader Edwyn Warwick has not decomposed.
But should the Pope sanctify a man who made his fortune through slavery?
And when Warwick’s body is stolen, it becomes clear that the priest’s mission has attracted the attention of a deadly conspiracy…
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