Doctor William (Tom Cruise) and his wife (Nicole Kidman) are attending a party held at the home of one of his customers, a local celebrity, when they happen to meet one of his college classmates, Nick, who is a pianist at the party. That night, William was away on business. After taking care of business, he met Nick again in a bar. Nick told him about a secret party: at the party, everyone wore evening gowns and masks, and there were naked beautiful women everywhere. William couldn't help but be curious and begged Nick repeatedly, who told him the address of the ball and the code word for entry. After making hasty preparations, William embarked on a dreamy adventure. The process is full of strangeness and mystery, and the mystery behind it is even more incomprehensible.