On a July afternoon, the body of a young woman is dredged from Sweden's beautiful Lake Vättern. Three months later, all that Police Inspector Martin Beck knows is that her name is Roseanna, that she came from Lincoln, Nebraska, and that she could have been strangled by any one of eighty-five people. As the melancholic Beck narrows down the list of likely suspects, he is drawn increasingly to the enigma of the victim, a free-spirited traveler with a penchant for the casual sexual encounter,...