Frederic, a pirate’s apprentice, falls head-over-heels in love with Mabel, the daughter of Major-General Stanley. Frederic is due to be released from his apprenticeship on his 21st birthday, but there’s a snag. Born on 29 February, Frederic discovers that he is technically still a youngster. Although very much in love, his dedication to duty is unshakeable. Can he find a way to live happily-ever-after with Mabel?