Kathy is out to get revenge on everyone who treated her badly because she was fat. She lures everyone to a private party where there is a card waiting for each of them. This card provides a idea of how each person will die. There are two exceptions though: 'party crasher' and 'new meat' deaths were planned after they got there. Kathy kills everyone including her accomplice (AKA her number one fan) in order for him to take the fall.