Maddie Hayes (Cybill Shepherd) is a stunning model who made a fortune as the girl in the Blue Moon shampoo commercials. David Addison (Bruce Willis) is a brash, self-styled private eye. If ever there were opposites, Maddie and David are the classic case. In no time, the fireworks start to fly when Maddie ends up broke after her embezzling business manager skips town. Feeling desperate, she sets out to liquidate what little she has left, including a detective agency run by wise guy Addison. Like all opposites, the two don't agree on anything, fight over everything, and discover a very strong attraction for one another. Add in a punk with a knife in his back, a vicious ex-Nazi, $4 million in long-lost diamonds, and suddenly David and Maddie are involved in a wild race of murder, mystery and suspense.