With many historical novels to her credit, published for the most part in England, Mrs. Lewis' latest one deals with the 14th century's Isabella of France who ""plights her troth"" and laments her plights with Edward II of England. He proves to be the real queen with his royal succession of bedfellows--the voraciously greedy Gaveston or the politically ambitious Ned Despenser. Isabella, her ""hot Capet blood"" curdling, plots sedition, Civil War and her husband's dethronement. As an ally and lover, she chooses the traitor Mortimer who causes Edward to suffer probably the most gruesome death on record. Young Edward, now in power, sickens of his mother's amoralities and executes Mortimer--then gets Isabella to a nunnery. . . . Well-researched it seems but the sensationalism guts the effect thereof.