Henry Crane is a small-time manufacturer venturing into the big-time business of human-like robots. His plan is to give the world a personal assistant ideally suited to each individuals needs and personality. The only problem is that his robots keep killing each other In the attempt to find the problem, Henry and his team of co-workers try various experiments, but it is only when Henry is prepared to risk his wife's sanity that they finally make the break-through - only to realise that the presence of evil helps to find and preserve good. Complicated? Yes, but that's life.