Travelling to Venice to locate an ex-partisan on behalf of a French insurance company, a British private detective gets mixed-up in a political assassination conspiracy.
| Actor | Role |
|---|---|
 Richard ToddEdward Mercer | Edward Mercer |
 Eva BartokAdriana Medova | Adriana Medova |
 John GregsonRenzo Uccello | Renzo Uccello |
 George CoulourisChief of Police Spadoni | Chief of Police Spadoni |
 Margot GrahameRosa Melitus | Rosa Melitus |
 Walter RillaCount Boria | Count Boria |
 John BaileyLieutenant Longo | Lieutenant Longo |
 Sidney JamesBernardo | Bernardo |
 Martin BoddeyGufo | Gufo |
 Michael BalfourMoretto | Moretto |
 Sydney TaflerBoldesca | Boldesca |
 Miles MallesonGrespi | Grespi |
 Eric PohlmannGostini | Gostini |
 David HurstMinelli | Minelli |
 Raymond YoungLuigi | Luigi |
 Ferdy MayneTio | Tio |
| JJill CliffordRenata | Renata |
 Eileen WayWoman Detective | Woman Detective |
| TToni LucardaNerva | Nerva |
| JJanice KaneNinetta | Ninetta |
 Meier TzelnikerMayor of Mirave | Mayor of Mirave |
| BBetty E. BoxWoman Next to the Factory Tour Guide (Uncredited) | Woman Next to the Factory Tour Guide (Uncredited) |
| VVictor HarringtonBystander (Uncredited) | Bystander (Uncredited) |