When some of Rosamond's tomatoes go missing right before the contest that will judge the best organic garden, Nate the Great and Sludge dig up the dirt on a surprising culprit.
While traveling on the train to San Francisco with his cousin Olivia's owl, Nate the Great and his dog Sludge must use all of their detective skills when the owl suddenly disappears.
"Nate the Great helps his friend Esmeralda find the word she wrote down that was going to be the name of the upcoming pet concert, before it's too late"--.