After a busy and mysterious summer, Cora is back at school and stumbles onto another mystery on her first day back While researching a school project, Cora discovers a treasure map tucked inside a book at the library. Cora is thrilled, and with the help of her dog Calvin, she can't wait to find what the map will lead to. But someone else wants her map, and will stop at nothing to get to the treasure first. What is the treasure, and will Cora get to it first? Cora's friends Shelby and Tricia join in, and with Calvin leading the way, the treasure hunt is on Book 3 in the 'Cora Flash' Series.