'Tis the season for hot chocolate and mouthwatering treats. But sometimes too much of a good thing can be downright deadly . . . Siobhán O'Sullivan's hopes for a quiet Irish Christmas are dashed when the local Santa turns up dead in a carnival dunk tank of hot cocoa. Now instead of hunting down holiday gifts, she's pursuing a heartless killer. Seems the dead Santa was no angel either, stealing neighborhood dogs to guide his sleigh. But was it his holiday antics-or worse-that led to his death by chocolate?