John is an unassuming but talented high school sophomore who finds a strange object while walking in the woods one quiet Sunday morning. There, catching beams of sunlight shining through the trees is an alien object The object is a Kinetic Assistant Disk, or KAD. It's smooth, silver, and about the size of a hockey puck. And John soon learns that it can be dangerous, too Although barely able to understand where the disk came from and what it is capable of, John quickly realizes that he's the only one who can save KAD before it loses power and is lost forever. The path to save KAD takes John on an adventure that draws on all of his wits and physical abilities. To rescue KAD, John must hide it from everyone, including a tenacious federal agent who's determined to get his hands on KAD, at any cost. But keeping KAD hidden proves to be quite difficult, as the disk becomes unstable and erratic, putting John's school and the entire neighborhood in jeopardy. KAD's actions even get in the way of John's budding romance with his high school sweetheart, Lena. Soon, however, John and Lena must work together in a race against the clock to save KAD. Their adventure brings them in the line of fire with the federal agents and sends them to distant alien locations, all while experiencing the potency of first love and dealing with the usual setbacks faced by all teenagers, including well-meaning parents, exams, and school activities. Can they save KAD in time?