Most Secret — John Dickson Carr

John Dickson Carr, master of the Golden Age British-style whodunit, delivers a dazzling historical mystery set in Restoration LondonIn England, the Civil War is finished, Cromwell is dead, and the monarch Charles II sits happily upon the throne. It is a fine time to be rich, young, and bold—and there are few in the kingdom more daring than Roderick Kinsmere. A country boy come to London to become a man, Roderick is drawn into a whirlwind of danger that will not slow until the streets of the metropolis are stained with blood.With the monarchy depending on him, Roderick knows survival will mean a quick study in the arts of court intrigue, piracy, and swashbuckling romance—and that somehow everything centers on the beautiful sapphire ring he inherited from his father.