"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 ...

"A friendly competition to grow the best organic garden is underway. The prize is tempting: a ribbon, an article and photo in the newspaper, and all-you-can-eat pancakes, a month's supply of apple pies, and three cases of ice cream from Uncle Ned's diner! Esmeralda, Annie, Oliver, and Rosamond are among the competitors. Just a few days before contest judging, some of Rosamond's tomatoes go missing, and Nate and Sludge are called to investigate. Who...