Tintin and his friends get involved in an unexpected and weird adventure when they meet Laszlo Carreidas, an eccentric millionaire.

Tintin and his friends travel to the Moon aboard the Syldavian nuclear powered rocket.

Tintin buys an old model ship at a flea market as a gift for Captain Haddock, who tells him about the exploits of a famous ancestor related to it. Then, Tintin learns that it is not an ordinary model ship.