Sent starts where Found ended. Jonah, his sister Katherine their friend Chip and Alex “land” in the fifteenth century. Jonah and Katherine were not supposed to time travel to the fifteenth century with Chip and Alex. They could mess up history. With the help of the Elucidator they are able to keep in contact with JB. Upon landing in the fifteenth century Chip finds out that he is Edward the Fifth King of England and France and that Alex is his brother Prince Richard.
The kids find themselves in a room where Chip and Alex see ghostly visions of themselves (called Tracers). They meld with their Tracers and are able to know the thoughts of the boys. The problem is that the longer they stay in their tracer body the harder it is for them to come back to their 21st century selves.
While in their Tracer bodies they learn that their uncle plans to kill them and become king himself. With the help of the Elucidator they become invisible so that they can move about more and find out what happened in that time of history.
In order to keep the kids from ruining history JB manages to bring Jonah and Katherine back so that he can coach them how to bring Chip and Alex back to the 21st century without ruining history.
I have to admit that I had a hard time following Sent. With all of the twisted time travel information and the history and the tracers I just got completely confused. It truly was hard for me to even finish the book, but I finished it because I hate to give up on a book. The ending does leave off for another book in this series. I am not sure that it is one that I will pick up again. For those people that like a Science fiction/history/Adventure story this may be right up your alley.