Caroline Lee's The Duke's Mysterious Lover is a delightful romp through Regency England, blending elements of romance, intrigue, and comedy in a way that keeps readers thoroughly entertained. The novel centers around Thorne Cumming, the newly minted Duke of Stroken, and Kit Pastorino, a former stage performer turned undercover valet. The story is a clever twist on the classic Regency romance, with Lee injecting a fresh perspective through her engaging characters and intricate plot.

At the heart of the novel is Thorne Cumming, a character who defies the typical mold of a Regency duke. Known for his libertine ways, Thorne is a man who revels in pleasure, whether it be with women, men, or both. However, the death of his uncle thrusts him into the responsibilities of dukedom, a role he is ill-prepared for and initially reluctant to embrace. Lee does an excellent job of developing Thorne's character, showing his growth from a carefree rake to a man who must navigate the complexities of high society and the expectations that come with his title. His journey is not just about learning to be a duke but also about understanding his own desires and the importance of choosing his companions wisely.

Enter Kit Pastorino, a character who is as intriguing as she is resourceful. Disguised as a male valet, Kit's mission is to uncover the truth about her estranged father. Her background as a stage performer adds a layer of depth to her character, as she uses her acting skills to maintain her disguise and navigate the treacherous waters of Thorne's household. Kit's transformation from a footman to Thorne's valet is both humorous and poignant, as it challenges the gender norms of the time and highlights her resilience and intelligence. Her interactions with Thorne are charged with tension and chemistry, making their evolving relationship a central focus of the novel.

The themes of identity and disguise are prevalent throughout the book, with both Thorne and Kit grappling with their public personas versus their true selves. Thorne's reputation as a rake is at odds with his newfound responsibilities, while Kit's male disguise allows her to explore freedoms she would not have as a woman. Lee uses these themes to explore broader societal issues, such as gender roles and the constraints of social expectations, adding depth to what could have been a straightforward romance.

Lee's writing is both witty and engaging, with a narrative style that captures the essence of Regency England while infusing it with modern sensibilities. Her dialogue is sharp and often humorous, particularly in the exchanges between Thorne and Kit. The comedic elements of the novel are balanced with moments of genuine emotion, creating a story that is both entertaining and heartfelt.

In terms of plot, The Duke's Mysterious Lover is a well-crafted tale of intrigue and romance. The subplot involving Thorne's efforts to trap a traitor adds an element of suspense to the story, keeping readers on their toes as they follow the twists and turns of the narrative. This element of mystery is woven seamlessly into the romance, enhancing the overall impact of the novel.

Comparatively, Lee's work stands out in the crowded field of Regency romances. While authors like Julia Quinn and Tessa Dare have popularized the genre with their own takes on dukes and debutantes, Lee's novel offers a unique perspective by focusing on characters who defy societal norms. The inclusion of a female protagonist in disguise and a duke with a fluid approach to pleasure sets The Duke's Mysterious Lover apart from more traditional offerings, appealing to readers who crave diversity and complexity in their romantic fiction.

Overall, The Duke's Mysterious Lover is a captivating read that combines romance, humor, and intrigue in a way that is both refreshing and satisfying. Caroline Lee has crafted a story that not only entertains but also challenges readers to think about identity, love, and the roles we play in society. For fans of Regency romance looking for something a little different, this novel is a must-read.