Louisa and Lucille are becoming accustomed to life in Wintercrest Manor. Lucy has discovered that her sister is quite content living her life with her strict husband, Lord Edward. Lucy begins her own journey of self-discovery when Lord Edward, her guardian, agrees that she may be courted. Though he has serious doubts about the man, Edward decides to allow Lucy's former mathematics professor, Charles Lloyds, a chance to prove his worth.

The Lord of Wintercrest Manor has married the love of his life in Louisa Furniss. She is slowly learning the rules of his household; rules she never thought she could obey, but her love and desire for her husband help her in her journey in submission as his child bride. Her lessons are suddenly halted when tragedy strikes. Her parents are killed in a carriage accident leaving her with only one living relative - her twin sister Lucy.

Leaving her twin sister Louisa and her husband Lord Edward Wintercrest behind, Lucy knows that while she is sad, it is only right that she follow her husband. Every aspect of traveling by train fascinates her.

Sir Gerald is having great difficulties with Caroline, his 18-year-old ward. He has always shielded young Caroline from the truth about the differences between men and women. Now Caroline has become much too curious for her own good, to the point where he must bring himself to punish her for hiding in closets in attempts to witness the pleasures he takes with his mistress. At his wit's end, Sir Gerald calls upon Dr. Reginald Brown and Dr. James Fairleigh. Caroline's wide-eyed innocence stirs Dr. Fairleigh far more than he thought possible.

In the service of England's spymaster (well, his niece, but surely he'll appreciate the help), Miss Mary Wilson is on a mission to uncover a treasonous plot. Though her only clue leads to the debaucherous secret society of the marquess of Hartford, a lifetime of being overlooked should ensure her access to all of the gossip her assignment will require. There's just one problem: Mary is due to find a husband this season, and her aunt Elizabeth, the Viscountess Hood, is determined to see her niece shine bright.