This Christmas, Sadie Hoffmiller Cunningham is making a list and checking it twice. For the first time since she and Peter married five years ago, their combined families are gathering for the holidays in Fort Collins, Colorado, for a party that would make Santa and Mrs. Claus proud. She just has to bake the famous Cunningham Candy Cane Cake, make sure the looming snowstorm doesn't derail everyone's travel plans, and oh, yes, solve one teensy-tiny...