While onboard the Holiday Express for your usual wintertime commute, you find yourself a bit overwhelmed with the hospitality. Overwhelmed in a good way, that is-- the train is full of amenities and entertainment, and you're rather comfortable. Until you're awoken by screams the next dawn, and one of your fellow passengers turns up dead. At the crime scene are two mysterious passengers who reveal themselves to be detectives: Cheddar Cheese Cookie and Macaroni Cookie. "Nobody move!" Cheddar Cheese Cookie says, swiftly taking control of the situation before the panic sets in.