England's Forgotten Queen: The Life and Death of Lady Jane Grey

Helen Castor investigates an incendiary document written on his deathbed by King Edward VI that cut his sister Mary Tudor from the line of succession and left the throne to his cousin Jane.

Three days into her reign, the clock is already ticking for Jane as Mary Tudor, determined to seize power of the throne, raises an army.

One of Jane's key supporters defects to Mary's side, taking thousands of supporters with him as the balance tips and the men who installed her on the throne abandon her.