Book excerpt: Kirsten Larson has been living on the Minnesota frontier for only a few weeks when her neighbor and friend, Erik Sandahl, disappears. Erik had promised to help the Larsons at harvest time, and he owes Uncle Olav money. Everyone believes Erik has run out on his promises-except Kirsten. Can she figure out what's happened to her friend? Written by Kathleen Ernst, a four-time nominee for the Agatha and Edgar Awards, this is the first mystery featuring the American Girl historical character Kirsten Larson. Includes a glossary of Swedish words and an illustrated "Looking Back" essay.