Remember Me to Harold Square (Hardcover, Turtleback School & Library ed.)

This summer could be a disaster. Kendra's parents have invited Frank, a 15-year-old she's never met, to stay with them. And they've planned a goofy scavenger hunt for the kids, including Kendra's bratty younger brother. They have to race all around New York City and visit places like the Empire State Building and the United Nations to find answers. But once they get started, Kendra doesn't mind the scavenger hunt so much, mostly because Frank turns out to be just as interesting as all of the sights.