Henry Young

… glasses changed, had even planned early last summer to do that little chore, but then Henry Young had called him one day in April, asking who the fellow was he’d seen Amy with at the mall—some relative, maybe?—and the suspicions which had culminated in the eerily quick and quiet no-fault divorce had begun, the shitstorm which had taken up all his time and energy these last few months. During that time he had been doing well if he remembered to …

The acquaintance tells Mort that he saw Amy at the mall.