Ever wish you could call back a promise you've made? David Stone, American, has adopted South Africa as his home and Marjie van der Leun as his lover. It's an on-again, off-again affair, but during one of the on-again stages, David made a commitment which would come back to haunt him. In a reckless moment, David said he would kill for her. Now Marjie wants to call in that favor.The arrangement involves a lot of money and once David is "in for a penny, he is in for a pound," as the saying goes.The plot thickens, Marjie is prosecuted for the murder and David thinks he has gotten away . . . until . . .