The Dark Forest by J. Keck

Hitchhiking in Bavaria, Evan is picked up by a womens' soccer club, and is invited to join them for a long weekend of soccer and revelry at a remote chalet in the German forest. Ruth, one of the club's members, draws close to Evan, confiding to him her family's secrets. This psychological and emotional story set in the beauty of the German forest, describes both the intimate romance of youth and the joy of a holiday turned ugly.