Ben van Rooyen buys a kris at an antiques auction in Amsterdam. He suspects that it is a real Matamaram Kris, a sacred kris with secret powers. This is confirmed by Professor Smit of the Tropical Institute. Because such a kris is of great value to the family to which it belongs, Ben, together with his younger brother Mark, wants to go to Indonesia in order to find the owner. But Ben isn't the only one interested in the kris.