July, 1573. Recently widowed, Ursula Blanchard is living a quiet life on her Surrey estate, caring for her infant son. But her peaceful existence is shattered when Ursula’s neighbour Jane Cobbold is found dead in her own flowerbed, stabbed through the heart with a silver dagger - and Ursula’s manservant Brockley is arrested for the crime. Determined to prove Brockley’s innocence, Ursula seeks help from her old mentor Lord Burghley. But when a second death occurs and the queen’s new spymaster, Francis Walsingham, gets involved, once again Ursula is reluctantly drawn into matters of espionage and affairs of state.