Following the crash of a satellite that everyone takes for the explosion of a flying saucer, Didier is the guest of the 8 P.M. newspaper. Rémy is afraid of being accused of the destruction of the satellite and of losing his position at GEPAN. Vera thinks the key to the mysterious phenomenon lies in the memories of the four witnesses. She helps them remember when they were in contact with the phenomenon.

Didier and Véra decipher the message linking the witnesses to the phenomenon. While investigating a crop circle in a cornfield, Marcel discovers the existence of a prototype microwave weapon. He thinks they were fooled by Commander Delbrosse. Didier is disillusioned. Véra continues to believe that the supernatural facts they have been confronted with are share Didier as the common denominator.