The queen's rivals - Brandy Purdy

As cousins of history's most tempestuous queens, Ladies Jane, Katherine, and Mary Grey were born in an age when all of London lived beneath the Tower's menacing shadow. Tyrannized by Bloody Mary and the Virgin Queen, the sisters feared love was unthinkable--and the scaffold all but unavoidable.
.
.

Raised to fear her royal blood and what it might lead men to do in her name, Mary Grey dreads what will become of herself and her elder sisters under the reigns of Mary Tudor and Elizabeth I. On their honor, they have no designs on the crown, yet are condemned to solitude, forbidden to wed. Though Mary, accustomed to dwelling in the shadows, the subject of whispers, may never catch the eye of a gentleman, her beautiful and brilliant sisters long for freedoms that would surely cost their lives. And so, wizened for her years, Mary can only hope for divine providence amid a bleak present and a future at the whim of the throne--unless destiny gains the upper hand.

A gripping and bittersweet tale of broken families and broken hearts, courage and conviction, The Queen's Rivals recounts an astonishing chapter in the hard-won battle for the Tudor throne.