Of Silk and Steam is a thriller novel by the author Bec McMaster that is the fifth book in the London Steampunk Series. In this part of the book; Lady Aramina seeks revenge against the Duke of Caine after her father’s assassination. Leo Barrons, the Duke’s heir, and her nemesis, becomes her leverage when she discovers his illegitimacy. Sentenced to death for duplicity, Leo escapes by holding Aramina captive.