The Venetian Affair (1966)

After an American diplomat inexplicably explodes a bomb during an international peace conference in Venice, killing himself and everyone in the room, CIA boss Frank Rosenfeld calls ex-agent Bill Fenner in on the case. Fenner is forced to find his ex-wife and save her from the clutches of both the good guys and the bad guys, while still obtaining the Vaugiroud report and uncovering the bombing conspiracy.