Keep Me (Sinful Manor #1) by Sara Cate; 2024. Softcover.

Sylvie Devereaux is the wealthy daughter of affluent artists living in New York City. During a trip with her boyfriend to Scotland, Sylvie sneaks into Barclay Manor to retrieve a photo of a family heirloom. While sneaking around the mansion, she meets broody Scottish billionaire Killian Barclay and runs from the house, dropping her phone in her haste to get away. Weeks later, she's approached by Killian's sister. She has a proposal for Sylvie-to marry Killian for a term of three years and ten million dollars under the guise of improving his playboy reputation. What Killian doesn't know is that the marriage scheme is really a front for his sister and the rest of his family to extract him from their family home, Barclay Manor, by utilizing the fine print of their family's trust against him. Sylvie agrees to these terms, but over the course of the three years, she starts to grow feelings for Killian and regrets what their marriage will do to him. Is the love of a good man with a dark soul worth telling the truth, or is she willing to break Killian's heart now that it's well and truly hers?