A wheelchair-bound businessman pays for the development of a time machine so his long-dead wife can be saved from an accidental death. Afraid to lose his funding, the machine's developer agrees to make the trip and save her - regardless of what the consequences might be to the timeline. Only too late does he realize that his boss's wife, in the original timeline, was on her way to kill her husband so she could run off with her lover. She is now free to do that again.