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 theses -- 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 toiler. He pressed the handle. The retainer, jostled int he surge, disappeared down the porcelain throat, and, when waters abated, floated triumphantly, mockingly, out, Mr. Lisbon waited for the tank to refill and flushed again, but the same thing happened. The replica of the boy's mouth clung to the white slope.