'A glorious work of history... a gripping and haunting tragedy... There was no book published this year, novels included, that I found richer in character; no plot more taut' - Tom Holland, The Spectator

'A dazzling tour de force of epic royal history: a compulsive, unputdownable real-life thriller, a gripping portrait of ruthless power politics, and a study of British tyranny ... written with the delicacy and elegance of one of Britain's most brilliant historians at the top of her game' - Simon Sebag-Montefiore

'Phenomenal historian Helen Castor's masterful plume plunges us into the depths of machination and the abyss of tragedy. This is a masterpiece that leaves the reader both satiated and breathless' - Olivette Otele, author of African Europeans

'If ever a book of history was blessed with contemporary relevance, this one is. The dumbfounding, delusional, narcissistic King Richard; the white-knuckle ride of Henry IV, dogged all the way by notions of illegitimacy. I feel these men could have been ripped from today's headlines. The book's great achievement is in the storytelling -- the unfolding drama, the secrets of power and ambition so beautifully controlled in the telling. The Eagle and the Hart will be a non-fiction book of the year and will deserve the ovations it is certain to receive. When history is this gripping there's nothing like it' - Andrew O'Hagan

The author of She-Wolves chronicles the lives and reigns of Richard II and Henry IV, two cousins whose rivalry brought their nation to the brink of disintegration - and back again

Richard of Bordeaux and Henry Bolingbroke were first cousins, born just three months apart. Their lives were from the beginning entwined. When they were still children, Richard was crowned King Richard II with Henry at his side, carrying the sword of state: a ten-year-old lord in the service of his ten-year-old king.

Yet, as the animals on their heraldic badges showed, they grew up to be opposites: Richard was the white hart, a thin-skinned narcissist, and Henry the eagle, a chivalric hero, a leader who inspired loyalty where Richard inspired only fear. Henry had all the qualities Richard lacked, all the qualities a sovereign needed, bar one: birth right. Increasingly threatened by his charismatic cousin, Richard became consumed by the need for total power, in a time of constant conflict, rebellions and reprisals. When he banished Henry into exile, the stage was set for a final confrontation, as the hart became the tyrant and the eagle his usurper.

Helen Castor tells this story of one of the strangest and most fateful relationships in English history. It is a story about power, and masculinity in crisis, and a nation brought to the brink of catastrophe. At its heart, it is the story of two men whose lives were played out in extraordinary parallel, to devastating effect.