Bloodstone Island is a sequel about the misadventures of two elderly confirmed bachelors Sydney Wadsworth, founder of an exclusive CC. in upstate New York, and his inseparable friend Toby Worthington. Set in 1948, Toby comes to the aid of club member, Harriet Bartholomew, a thrice-married widow who claims Bloodstone Island off the coast of Maine as her rightful inheritance. Sydney joins the fray and becomes cozy with Abigail Underwood, justice of peace in Port Henry, Maine. Together, the foursome discovers her island is occupied by an international criminal bringing stolen works of art by the Nazis into the United States.