The man must marry - Janet Chapman

When Willa Kent rented a cottage to the funny old man who showed up at her door in rural Maine, she never expected that Abram Sinclair would turn out to be the owner and CEO of a shipping empire. Or that he'd ask her to go to New York City to give his proxy vote for a new CEO since he's dying. Or that he'd ask her to choose which of his very handsome, intelligent, and very eligible bachelor grandsons should succeed him! Then Abram dies, and Willa finds out he's left everything to her - if she marries one of the grandsons within 3 months. Otherwise the company will be sold to their competitor and arch enemy at a loss.

Willa flees on Abram's sailing yacht to think things through, and Sam Sinclair, the oldest brother, decides to go after her. She's naive, smart-mouthed, big-hearted, and quietly beautiful - and his pursuit isn't just about the money. And when he catches up with her, he enlists all her family, neighbours, and employees in his cause!