简介：PrivatedetectiveEdwardMercergoestoVeniceattherequestofaFrenchinsurancecompanytolocateabraveItalianwhomtheywishtorewardforhispartintherescueofanAlliedairmanshotdownduringthewar.Atleast,thatiswhatMercerthinksashestepsoffthesteameratthePiazzaSanMarcoandisgreetedbyasmilingstreetphotographer,Cassana.Mercermakeshiswaytoashopandfindshisfirstcontactdeadfromaknifestab,andthetrailleadshimtoAdrianna.HefacesdangerfrompolicechiefSpaloniandalsofromagroupofforeignpatriots,ledbyCountBorianandLieutenantLongo,whowanttousehimasastool-pigeonforaplannedCoupd'Etat.Ahecticraceacrosstherooftops,highabovethegreatsquare,bringsMercertogripsagainsthisunknownenemy.…