Giulio and Armando, both married, attempt an escape from their respective married lives, invent a secret mission and leaves for the south.

Widowed at the age of twenty, Madame Boissière is a real mother hen, excessively brooding over her two sons Robert and Claude. She spoiled the marriage of one and kept the other away from any female presence. The latter runs off and marries a girl from the mountains. When his brother dies, the couple agree to return to live with Madame Boissière, who tries to separate them.

Krios, the youngest of the Titans, may be the least strong of the seven brothers whose strength comes from their mother, earth-goddess Gaia, but is by far the smartest, and thus their natural leader. He arrives on Crete, the kingdom of the mighty king Minos, impresses him as gladiator, gains his trust, falls in love with a mortal girl and discovers both Minos's human sacrifice-cult and a foreign conspiracy to seize power with a hidden army.