The year is 1912. Kramer (Harry Andrews) has carved out a private empire for himself in West Africa, complete with a personal militia. But, as his daughter, Erica (Ursula Andress), and the American geologist Dan Rockland (George Segal) are celebrating their engagement, Kramer's fabulous diamond, the Southern Star, disappears. Dan's African helper, Matakit, suspected of the theft, flees into the jungle, pursued by Dan and Erica, who believe him to be innocent, and by Kramer's militia commander, who wants the diamond for himself. Based on a Jules Verne tale, this comedic adventure features excellent performances from its top-notch cast (including Orson Welles). Directed by Sidney Hayers (Burn, Witch, Burn! and TV's "The Avengers").