Middle readers looking for a series about time travel adventure will enjoy the third book in the series, Honor and Mercy. I would suggest the first two books in the series be read to fully appreciate the evil “trackers” who want to destroy the earth.
Check out this link to read more about the series.
The readers quickly gets pulled into the story as one of the main characters is skateboarding and is seriously injured. The story follows his rehab and introduces him to characters in the first two books who time travel and fight the trackers.
Themes of Christianity and history make this an interesting read as the characters try to do what is good to help the world in the past and the present.