I received a copy of this book from BookSprout and this is my freely given opinion.
This is the 6th book of the series by Charlie Lane, with the main characters being Lady Sarah, younger sister of Tabitha from book 1, and Xavier Evans, Viscount Flint, one of the brute brothers of Lady Edith from book 5. Both Sarah and Flint seem to have a bit of an identity issue in how they see themselves and perceive their place and roles in the world, and are constrained by societal norms/expectations, and their perceptions of what their family/friends want for them. One way Sarah seems to want to define herself is through her work with a charity hospital. She obviously has an interest in medicine and helping others, but as a lady it would be frowned upon to engage in things like that hands on so she finds creative ways to fund them, including wagers on dares. To preserve her reputation, she and her friends hide their identity in Georgian costumes and she has gained some notoriety as the Dare Queen.
Flint was the previously crowned Dare King, but because of some past mistakes, regrets, and guilt held close to his chest, he has resolved to do better and stick the straight and narrow. He sees what Sarah's doing and recognizes her, and convinces himself that he will get involved in her schemes to stop her for the sake of his sister, her good friend. He wants to stop her before she ruins or hurts herself. He does not initially realize what her motivation is, until she confides in him. Deep down also, he misses the thrill of adventure, and initially suppresses his attraction to her, thinking he would look for a "proper" bride in the mean time. But, as follows the enemies to lovers trope, they grow closer and as they trust and confide in each other, becoming more conspirators than rivals, and Flint realizes that he wants her to be his bride.
This was a rather cute and sweet story, especially as Flint and his brothers came across as such idiotic, bumbling, misogynistic boors in their sister Edith's story. I did not find it as compelling as others in the series, but did enjoy the episodes where Flint and Sarah shared and were more open with each other, such as when they dared each other and then shared their ride on Mr. Clarke's new invention. I did not fully understand the motivation of Clarington as the villain/enemy of the piece though.
3.25 stars out of 5