It was April in Rome, and gathered together in the church of San Tommaso in Pallario
 was the kind of varied group of people that can only meet on a tour. They were there
 under the aegis of one Sebastian Mailer, who had promised them a most unconventional
 tour — a claim no one later disputed, after encountering murder, blackmail and 
drug-running. Inspector Roderick Alleyn, in Rome on a special mission, became 
involved in the case, and found it one of his most baffling — a case in which every
 suspect might equally well prove a victim…
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