Kirsten and her family are very new to America when this mystery takes place: they find themselves homesick and a little afraid. They also discover that they have new friends and neighbors who are willing to help them out. One of their friends, however, is suspected of running out on his loan. Kirsten doesn't think he'd do that, and she works hard to look for clues to discover why he has disappeared. It turns out that his sister was in trouble, and he hurried to help her without even thinking about it. ( )