F.B.I. agents David Blair and Thelma Avery are assigned to search for Professor Weiss, who had mysteriously disappeared after discovering an antidote for atomic radiation.
It's the story of a day spent by Dino, separated by his wife, who sees his son Robertino after five years. Dino has not contributed anything in life and to win the affection of his son, invents a story about his past. At the end of the day however, he will succeed in establishing a positive relationship with his son and telling the truth about himself.