"The Iron Duke" is a historical romance novel set in an alternate universe where British society is governed by a corrupt aristocracy, and humanity fights against the threat of dangerous creatures known as the Horde. The story's protagonist, Mina Wentworth, is the daughter of a well-known traitor and is determined to find her own place in a society that stigmatizes her heritage. She is strong-willed and seeks independence, reflecting the struggles of women during this tumultuous era. The titular character, Rhys Trahaearn, also known as the Iron Duke, is a powerful and formidable figure who emerges as a hero after defeating the Horde. His status and reputation are both a blessing and a curse, as he navigates the treacherous waters of political intrigue and societal expectations. As Mina and Rhys's paths cross, they are drawn together in a complex relationship filled with tension, attraction, and misunderstandings.