Romancing Mr. Bridgerton is a captivating Regency historical romance novel by Julia Quinn. It is the fourth book in the Bridgerton series and follows the story of Penelope Featherington, a wallflower who has been secretly in love with her best friend's brother, Colin Bridgerton, for years. When a scandalous gossip column threatens to expose Penelope's deepest secret, she finds herself drawn closer to Colin as they work together to uncover the identity of the mysterious gossip writer. With its charming characters, witty dialogue, and heartfelt romance, Romancing Mr. Bridgerton is a must-read for fans of Regency romance.