Dirty Money (1972)

Following a raid on a bank in a seaside town, four Parisian gangsters flee after a cashier sets off the alarm with only part of the loot and with one of the men, Marc Albois, wounded by the cashier, who Marc then shoots dead. They put Marc in a private clinic and disperse. Their leader, Simon, owns a nightclub that is visited regularly by police detective Coleman to keep an eye on Simon and pick up information. Coleman also hopes to see the beautiful Cathy, who is Simon’s mistress but spends occasional afternoons with Coleman in a hotel room. Fearing police will find and question Marc, Simon sends Cathy into the clinic dressed as a nurse to give the dying man a fatal air embolism after an attempt to take him away fails.

Simon’s next project is to steal a large quantity of heroin being transported out of France by a rival gang on the night express from Paris to Lisbon. From a helicopter, he is lowered onto the speeding train in the empty countryside south of Bordeaux, breaks into the courier’s sleeping compartment, neutralizes him with chloroform, and is successfully winched up with the drugs. Knowing the dead Marc was friends with Louis Costa, Coleman arrests him and gets him to confess the names of his accomplices.