The Doctor's Convenient Marriage (Second Chances of the High Country) by Lauralyn Keller

She wants the freedom to practice medicine, and he needs a wife. But their bold escape from Boston’s high society rests on a marriage vow neither intended to make real. Victoria Mountbatten has fought hard to earn her medical degree, but her powerful father uses his influence to block any doctor from hiring her. Faced with an ultimatum—marry a society gentleman or face disinheritance, Tori sees only one path to freedom. She makes a bold proposition to Dr. Harrison Blake, a colleague she's worked alongside for years: a plan that will take them far from Boston's stifling society. Harrison Blake has always dreamed of building a hospital in the untamed West where he can truly help people. But his inheritance comes with a catch—he must marry before his thirtieth birthday. So even though Tori’s proposal is shocking, a marriage of convenience may be the perfect solution for both of them. In the quiet moments of Harmony Springs, feelings grow and lines blur. Can their partnership blossom into true love, or will the walls around their hearts destroy the fragile trust they've built?