Folge 1.

On his way to work, Vincent, in his thirties, picks up a ringing cell phone from the ground and answers it. He hears a woman screaming and a threatening voice saying, “If you're not there by 5 p.m., we'll kill your wife.” Alban, his 45-year-old colleague with a fiery temperament, already sees himself as the hero of the day and urges Vincent to take action.