The Earth Day Fair is days away, but Nate's classroom project--a robot named Mr. Butler--has disappeared. Nate the Great and his dog, Sludge, take on the unusual case, and they are soon searching high and low in and around the school. Will Nate find the robot in time for the fair?

Ages 6-9.|||Grades 2-3.|||juvenile

by Andrew Sharmat ; illustrated by Olga and Aleksey Ivanov in the style of Marc Simont.

Includes activities.