When Mattie Larimore is sent to reform school he uncovers a creepy conspiracy, led by Headmaster Rooney, to fix all the problem children, including Mattie's brother--for good.
Their latest adventure takes teenagers Dawkins and Hypatia back to thirteenth-century Nottingham and Sherwood Forest, but when they find a time-traveling device in a cave they find themselves far in the future--and closer to the forces that are tampering with time.