On June 17, 1982 the body of a well dressed man is found hanging under London's Blackfriars Bridge with no identification, however in his pockets are a brick and $15,000 in various currencies. Murder? Suicide? Inspector 'Serge Porter' is called in to investigate the case when it is discovered the hanged man is none other than Roberto Calvi, an Italian banker, chairman and director of Banco Ambrosiano.