In the summer of 1943, as World War II rages on, Ben MacCarthy is haunted by the disappearance of his wife, the actress Venetia Kelly.
Searching for purpose by collecting stories for the Irish Folklore Commission, he travels to a remote seaside cottage to profile the enigmatic Miss Kate Begley, the Matchmaker of Kenmare.
Ben is immediately captivated by her, and a powerful friendship is forged. But when Charles Miller, a handsome American military intelligence officer, arrives on the scene, Miss Begley looks to make a match for herself.
Miller needs a favor, but it will be dangerous. Under the cover of their neutrality as Irish citizens, Miss Begley and Ben travel to London and effectively operate as spies. As they are drawn more deeply and painfully into the conflict, both discover the perils of neutrality—in both love and war.