Hallowe'en Party

Thirteen-year-old Joyce Reynolds is murdered at a Halloween party. She was killed by being dunked in the bucket used for bobbing for apples. Earlier in the day, Joyce was telling everyone how she saw a murder some time ago. (Joyce is known for exaggerating and lying, so no one took her seriously at the time.) But now, with her death, maybe she was telling the truth. A lady author (Ariadne Oliver) that was at the party visits Hercule Poirot and asks him if he can look into this. He agrees. Will Poirot find out who the murderer is?