Arnold is about to enter the sixth grade. His good friend Addy, a fellow resident of the boarding house, tries to console and rid him of his first day jitters. What's really on his mind is Helga G. Pataki and the F.TI. incident. Why couldn't he stop thinking about it? Arnold just can't shake the feeling that one day, he will find his real parents. The sixth grade class takes a trip to San Lorenzo, the country Arnold's parents have resided since not long after he was born. It is up to Arnold, Addy, and Helga to save their friends when the trip goes wrong. Little do they know, they'll find out more about themselves than they would've ever known. Can they do it? Will Arnold and Helga resolve their unspoken-of tension? ...Will Arnold ever find his parents?