When journalist Kevin Burns gets a call from former schoolmate Carl Greene, he's surprised. They weren't that close at school and the temperature cooled even more when Carl married Kevin's girl, Lucy. Carl, a scientist, sounds anxious and afraid. They arrange to meet at a baseball game in Denver but Carl never makes it. Someone kills him first. Soon after, Lucy surprises a masked figure prowling Carl's study. Whatever her husband was working on, a lot of people want to get their hands on it. Some are clearly prepared to kill for it, though not the prowler who, it turns out, is a woman with quite a different agenda...