You will be given a definition of a task first, then some input of the task.
In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: In a small New England town during the frigid winter season of 1979, four elderly friendsbusinessman Ricky Hawthorne, lawyer Sears James, Dr. John Jaffrey, and Mayor Edward Charles Wanderleyform the Chowder Society, an informal men's club who get together each week to share tales of horror. Edward's son David, living in New York City, falls from his apartment window after seeing a girl he's been sleeping with suddenly turn into a living corpse. His other son, Don, comes home at Edward's request. Some time after David's funeral, Edward sees him walking through town during a snowstorm and follows him to a bridge, where he disappears. Calling out to his dead son, he suddenly sees a female apparition and he falls to his death from the bridge. Meanwhile, two escaped patients from a mental asylum, Gregory and Fenny Bate, have taken up residence in the old Eva Galli house, now in ruins.
Output:
Who disappears at the bridge?