by R. L. Ullman (Author), Yusup Mediyan (Illustrator)

Elliott has to follow a time-trotting trouble-maker and can't mess with history or reveal his identity, but his own existence is up for grabs when his parents hate each other and a mysterious villain is searching for a powerful cosmic object that threatens the universe. Aligned to Common Core Standards and correlated to state standards. Chapter Books is an imprint of Spotlight, a division of ABDO.