A spirited, adventurous twelve-year-old, Jessie Hanson, witnesses a hit-and-run accident in which a young girl is injured. With the help of her best friend, Tina Adams, she uses her detecting skills to cut through the victim's amnesia and track down the driver of the deadly automobile. This is the third in The Willow Lane Mysteries novella series, aimed at readers ages 9 to 12.