The novel OPA unvaryingly narrated by either John or Lorraine.
The novel begins with an "oath" signed by John Conlan and Lorraine Jensen, two high school sophomores, which pledge that they will report only the facts about their experiences with Mr. Angelo Pignati.
While John, Lorraine and some other freaks are making prank phone calls, Lorraine picks out Mr. Pignati's phone number and pretends to be calling from a charity called the L & J fund. Mr. Pignati offers to donate ten dollars, and John and Lorraine travel to his house to collect. From the first meeting, the two teenagers and the old man become close friends. Mr. Pignati finds new vitality and happily takes on the role of father figure for the two just to help them out.
The next day, Mr. Pignati takes John and Lorraine to the zoo to meet Bobo, a baboon he has taken a liking to. The animal is vicious and ill-tempered, but Mr. Pignati doesn't seem to mind, speaking lovingly to the baboon and feeding it peanuts.
John and Lorraine's visits to the Pigman become increasingly frequent, and during one such visit they discover documents that show that Mr. Pignati's wife is actually dead, not just on vacation as he had previously told them. Soon they are visiting him every day after school, and he showers them with gifts, food, wine, and most importantly the love and attention they do not receive in their own joyless homes. They reveal to him that they were never affiliated with any charity, and he reveals what they already know: that his wife is dead.
The true betrayal comes, however, when John invites friends over to the house. The situation quickly turns into a drunken, boisterous party during which Mr. Pignati's house is ransacked and his late wife's collection of porcelain pigs is smashed.
Mr. Pignati returns to find his house ransacked, and is incredibly hurt when he finds out John and Lorraine are responsible. They both feel terrible, and offer to take him to the zoo to help make up for it. At the zoo, they discover that Bobo the baboon has died. Mr Pignati, overcome with grief dies leaving John and Lorraine grieving
参考资料:英语功底