Jane Dunn's Elizabeth and Mary: Cousins, Rivals, Queens offers a blend of history and biography that traces the "dynamic interaction" between two of the most powerful women in Western history. Dunn remains ever aware of the uniqueness of her two central figures: both women ruled as divinely ordained monarchs in a male dominated power structure; and both women were from the same family (Elizabeth I was the granddaughter of Henry VII, and Mary Queen of Scots the great-granddaughter of King Henry). By focusing not on pure biography but instead on relationships, Dunn is able to narrow her book (still mammoth in scope) to the most salient and interesting events in the two queens' lives. The book begins in 1558, the year in which Mary first wed and Elizabeth assumed the throne of England. Almost immediately the cousins were embroiled in a conflict that would endure for the remainder of Mary's life. A restless, sexually-active Catholic, and leader of the Scottish people in alliance with France, Mary was ever a conduit for rumors of rebellion. The "Virgin Queen" Elizabeth used Mary as a dark reflection to underline her own celibate constancy as a ruler of law and order. The pair never met face to face, but as Dunn reveals, their lives were closely intertwined. After holding Mary in Fotheringhay prison for nearly two decades, Elizabeth ordered her cousin executed in 1587. Mary had chosen martyrdom in favor of a confession to complicity in the Babington assassination plot. In court, she declared: "I would never make Shipwreck of my Soul by conspiring the Destruction of my dearest Sister." Though the ostensible victor, Elizabeth (who had struggled to find a way to release her cousin while still upholding her own power as queen) confessed, "I am not free, but a captive." In Elizabeth and Mary, Dunn has built a rich world that underlines the tragic struggle between private emotions and the public faces history puts on them. --Patrick O'Kelley