The Penance of Portia James

This novel tells the story of Portia James who loves dancing. At age 16, Portia is betrothed to Wilmer James' business partner, John Morrisson. Willer James made John Morrisson promise not to appear in Portia's presence until she had completed her twenty-first year. She falls in love with Harry Tolhurst while visiting a gallery. What happens to Portia when her betrothed shows up on her twenty-first?