Explorer Tony Cooper and homesick trader Norton find a skeleton in the African jungle with a package intended to be delivered to Victor Wilkins in London. Cooper takes it there and it proves to be from Wilkins' brother - the skeleton was his - with a map showing where he left £100,000 in diamonds for Victor. Cooper agrees to accompany him to Africa and they hire pilots John Trevor and Carol Reed, who all agree to a cut of the profits. On arrival in Africa, they're challenged by three men - Redfern, Collins and Quincey - who claim to have the mineral rights to all gems found in the area, and by Norton, who also wants a share. But Norton is stabbed to death and Trevor fatally wounded: suspicion falls on Cooper, who's in love with Carol. Carol investigates and finds the weapon in the possession of Wilkins, who wanted the diamonds all for himself. He tries to flee in one of the planes but crashes and is killed.
