Natalie Black, the U.S. ambassador to the Court of St. James, has returned to Washington, her job in jeopardy. Her fiance, George McCallum, has died in a car accident, and mysterious rumors that she's responsible begin to surface. When she returns to the US, she's nearly killed when a car tries to mow her down while she's out for a run. Meanwhile someone is following Sherlock. Then someone tries to shoot her from the back of a motorcycle, but the assailant gets away. This is not good news.