Information for I Capture the Castle at Octagon Theatre, Bolton (Musical). Cassandra is 17. She's writing a diary about her eccentric family: her irritating elder sister Rose; her unconventional stepmother Topaz; her orphaned admirer Stephen; and her novelist father James, who hasn't written a word in years. They are behind with the rent for the tumbledown castle that seemed so romantic when they moved in. The roof is leaking, it never stops raining and the family is surviving on oatcakes and eggs. But the new landlord is a wealthy young American, with an attractive younger brother, and spring is in the air. Perhaps things are about to change. Set in the bohemian England of the 1930s, Dodie Smith's worldwide bestselling classic is a warm and sharply funny coming-of-age story.