A detective gets involved with the beautiful daughter of an old friend. The daughter turns out to be a jewel thief, who in turn gets the detective involved in a caper in Austria.
| Actor | Role |
|---|---|
 Rock HudsonCapt. Mike Harmon | Capt. Mike Harmon |
 Claudia CardinaleEsmeralda Marini | Esmeralda Marini |
 Tomas MilianRoger | Roger |
 Leon AskinChief Wellman | Chief Wellman |
 Ellen CorbyMaddy Walker | Maddy Walker |
 Walter GillerFranz | Franz |
 Guido AlbertiUncle Camillo Marini | Uncle Camillo Marini |
| PPeter DaneAlbert Kinsky | Albert Kinsky |
 Tony Lo BiancoOfficer McClusky (uncredited) | Officer McClusky (uncredited) |
 Claudio TrionfiNot listed | Not listed |
| VVittorio CampanellaNot listed | Not listed |
| GGianni MinghiniNot listed | Not listed |
 Raniero DorascenziNot listed | Not listed |
 Filippo PeregoNot listed | Not listed |
| AAndrea EsterhazyNot listed | Not listed |
 Aldo FormisanoNot listed | Not listed |
| RRuggero SalvadoriNot listed | Not listed |
 Alessandro TedeschiNot listed | Not listed |
 Empedocle BuzzancaNot listed | Not listed |
 Alfonso GigantiNot listed | Not listed |