Mr. Lisbon knew his parental and neighborly duty entailed putting the retainer in a Ziploc bag, calling the Kriegers, and telling them their expensive orthodontal device was in safe keeping. Acts like these—simple, humane, conscientious, forgiving—held life together. Only a few days earlier he would have been able to perform them. But now he took the retainer and dropped it in the toilet. He pressed the handle.