It's July 1575: Elizabeth I, Queen of England, arrives at Kenilworth Castle amid pomp, fanfare and a wealth of lavish festivities, laid on by the Earl of Leicester. The hopeful Earl knows this is his very last chance to persuade the Queen to marry him. But despite his attachment to the Queen and his driving ambition to be her King, Leicester is unable to resist the seductive wiles of Lettice, wife of the Earl of Essex. And soon whispers of their relationship start spreading through the court. Enraged by the adulterous lovers growing intimacy, Elizabeth employs Lucy Morgan, a young black singer and court entertainer, to spy on the couple. But Lucy, who was raised by a spy in London, uncovers far more than she bargains for. For someone at Kenilworth that summer is plotting to kill the queen. No longer able to tell friend from foe, it is soon not only the queen who is in mortal danger - but Lucy herself.