Marc Elbichon, a novice private sleuth, is investigating a wave of assassinations bearing a particular characteristic: the perpetrator, dubbed the "telephone killer" always strangles his female victims with a telephone cord.
A country boy loves the daughter of his boss and godfather. An engineer who comes from the city is interested in the young woman who corresponds to him against his will.
Paul and Rene, two men in their forties weary with life. One a widower, the other is divorced and pays alimony to his ex-wife. They live together, go on vacations together. This last vacation has been a washout and so is their return.
