Twins Polo and Twitch were born with only one heart between them. Twitch was the lucky recipient and therefore cannot stop falling in love. Polo, on the other hand, is literally heartless - a cold and clinical creature who shies away from intimacy of any kind. As they return to the island of their birth for their twenty-fifth birthdays, they meet up with Twitch's new American boyfriend, Billy, and her feisty best friend, Jacks, for a night on the town and some trips down memory lane.