The fragile peace between England and France fractures as Isabella, the Queen of England, orchestrates a daring political and romantic alliance that threatens to topple the English throne. Isabella, neglected and humiliated by her husband Edward II, travels to France under the guise of diplomacy to resolve territorial disputes. She encounters the exiled baron Roger Mortimer, and their burgeoning affair transforms into a calculated conspiracy to seize power. The narrative follows the intricate machinations of the French and English courts, where every alliance is temporary and every betrayal is a matter of survival. The prose maintains a detached, chronicler-like perspective, emphasizing the cold logic of medieval power struggles.

This work is widely regarded as a cornerstone of historical fiction, noted for its rigorous adherence to the brutal realities of medieval governance. Readers and critics frequently highlight the author's ability to transform dense historical records into a fast-paced, high-stakes narrative that mirrors modern political thrillers. The characterization of Isabella as a complex, driven figure provides a compelling anchor for the broader dynastic conflicts depicted throughout the series. The text is consistently praised for its lack of sentimentality, offering a stark look at the mechanisms of power that shaped the medieval world.