Operation (game) amongst the players at the beginning of the game. In the U.S and Australian version, players take turns picking "Doctor" cards, which offer a cash payment for removing each particular ailment, using a pair of tweezers connected with wire to the board. Successfully removing the ailment is rewarded according to the dollar amount shown on the card. However, if the tweezers touch the metal edge of the opening during the attempt (thereby closing a circuit), a buzzer sounds, Sam's nose lights up red, and the player loses the turn. The player holding the "Specialist" card for that piece then has
The Body in the Library heart attack. Seeing Josie arrested and the plot exposed, Mark breaks down and confesses. The book ends with some happy news for other characters. In her "Author's Foreword", Christie describes "the body in the library" as a cliché of detective fiction. She states that when writing her own variation on this theme, she decided that the library should be a completely conventional one while the body would be a highly improbable and sensational one. In light of these remarks, this novel can be considered a conscious reworking of the genre. An unusual feature of "The Body in the Library" is