Georg Sommer is a macho through and through. His life consists of hot nights with beautiful women, expensive cars, and finally, the coveted position as sales manager at a champagne company. But then, out of nowhere, the resolute Wally enters Georg's life and snatches his promotion from under his nose. Wally knows the most intimate details of Georg's life and claims to be his feminine side incarnate – the woman within him! She knows that his brother Michael has been mentally disabled since a serious car accident – Georg's weakest spot. While the womanizer still believes he's on the winning side, Wally quickly wins the sympathy of Lisa and Georg's colleagues. It quickly becomes clear: two is one too many! And Wally isn't prepared to give up her existence without a fight.