The film begins in Paris. A man, called Bérard, flees from his pursuers with a metal suitcase. He follows the instructions on a walkie-talkie and sits down in a chair. At a certain point he throws the suitcase into the depths. Then he is shot by an undetected sniper. Thus begins the story to a strictly guarded NATO controller for missiles - the so-called B 501 - which was stolen and device in this way in enemy hands. There is just this one model, and in the Paris command post of NATO prevails frenzy. The commanding officer, Colonel, gets eight days in which to recover the device. Hence he places his best man, secret agent Philippe Tissot, in this case on. Tissot is to remain undetected necessarily in this secret mission and therefore operated under the code name "Caesar". He quickly takes to track down the missing device.

This trail leads to Vienna. Tissot takes the night train and met there already some obscure figures who behave suspiciously abundant and strange. In the Austrian capital arrived, Tissot moves into the "Palladium", a variety theatre with a very dubious reputation. This establishment is considered as a transit point for stolen goods and secret as not dangerous playground for enemy agents and assassins. Behind the scenes of this only seemingly harmless amusement facility eventually all the threads together, murders are prepared and exchanged information. Soon Tissot gets into great danger, and there are the first bodies. Another trail leads him to a waxworks. In an exciting chase through Vienna Tissot can finally bring the control unit back in.

• Pierre Brice as Philippe Tissot
• Heinz Drache as Pierre Gilbert
• Daliah Lavi as Irina Badoni
• Jana Brejchová as Violetta
• Charles Régnier as Henry
• Walter Giller as Renato Balli
• Terence Hill as Enrico (credited as Mario Girotti)
• Gustav Knuth as Igor
• Anton Diffring as Burger
• Senta Berger as Captain Jenny
• Paola Pitagora as Claudette
• Daniël Sola as Joscha
• Walter Regelsberger as Gorba
• Hans Unterkircher as Bernard
• Karl Zarda as Ledin
• Erica Vaal as Jeanette

• Schüsse im Dreivierteltakt at IMDb