An engineer named Francesco arrives on Emerald Island in the Seychelles and is instantly smitten with the local girl Jeanine, whose sister ran off with the previous engineer -- neither of them to be seen again.
John and Howard work in a company named Safari Express booking tourists on safaris. Their lives are turned upside down when they encounter a beautiful blonde wandering in the jungle who doesn't know who she is. They also discover uranium and what appear to be some well-mannered simians.
Lieutenant Giovanni Drogo is assigned to the old Bastiani border fortress where he expects an imminent attack by nomadic fearsome Tartars.
