"What happens one evening when Mayor Kligore forgets to restart Sleepy Hollow's Halloween curse and loses his grip on the town for a day? It snows! Everyone is excited when they awaken to three feet of the fresh, snowball-quality white stuff. It's the first wintery free day the kids can remember. But when an epic snowball fight between good and evil breaks out, Harry Moon knows Halloween never left at all"--Back cover.
When Rider Woofson and the P.I. Pack arrive at the top of Mystery Mountain, they find their classmates have left, scared away by a snow monster, so the detectives decide it is time to investigate exactly what is so mysterious about this mountain.
"It's a winter wonderland on Birdwell Island! After a big snowstorm, Clifford and Emily Elizabeth get their first snow day. The best friends have a blast playing Snow Rescue Squad and helping Fire Chief Franklin take care of snow duties across town. But Clifford catches a cold from his busy day outside! The big red dog can't stop sneezing and sniffling. Can his friends on Birdwell Island help him feel better?"--.