Isa Rambaud

A former secret agent, who retired and wrote a first novel which tells the eventful adventures of his hero "Le Léopard ", comes back to work, reluctantly helped by an old maid.

Henry Roubier, a French promoter, and Enrico Mazzini, an Italian, have signed an agreement guaranteeing them a stranglehold on European highways. While driving on the roads of the south, Roubier takes two young hitchhikers, but an unfortunate swerve the car rushes by Henri and its occupants on the top of a pine tree onto the side of a cliff.

A woman's father, a scientist, receives repeated death threats and eventually ends up dead. Receiving no help from the police, the woman begins to realize that she is next.

The murder of a bandit gives a policeman the opportunity to unmask the activities of a spy.