A mermaid. A shipwreck. And a murder. It's our maritime heritage. The annual Yankee Old Home Days festival in Libertyport, Massachusetts, has hit rough seas. The new preacher in town is firing up his flock to protest a saucy sculpture. A booze cruise goes overboard. And a fisherman's son dies violently in his apartment above the Thirsty Lobster bar. Singer-songwriter Baxter McLean (star of the first Libertyport mystery, "Mirror Ball Man") will have...