Set in 1546, Herring's captivating debut depicts the future Elizabeth I as a keen and shrewd detective. A killer is stalking London, beheading young women and dressing their bodies in nuns' clothes. When one of the princess's own ladies becomes a victim, the 12-year-old Elizabeth, daughter of the now failing Henry VIII, joins with her friends Simon Maldon, a physician's son, and Hugh Bellows, the captain of the king's Welsh Guard, in the hunt for the murderer, though they're careful to keep Elizabeth's involvement a secret from her father. Filled with colorful and believable characters from all classes of society, the story moves swiftly to its dramatic conclusion. Fans of historical mysteries will look forward eagerly to the next in the series. (Jan.)