Didier faces the commission of inquiry which assesses his responsibility in the explosion of the CRISTAL rocket. His ex-wife, Elise, is one of them. Zorel is ready to deliver to GEPAN the film sought by the army which would be the proof of a UFO phenomenon, provided that Didier helps him to escape.

Commander Delbrosse gives Didier an ultimatum to prove that the UFO threat is real. Elise and Didier start working together again but Elise becomes concerned when she sees that Didier is beginning to believe in the possibility of extraterrestrial life. Véra goes to meet one of the witnesses who was in contact with the phenomenon to understand what he experienced.