Twins Lucy and Samuel know EXACTLY what they want for Christmas - a puppy of their own! Mum and Dad take them to Battersea Dogs Home a few days before Christmas, warning them to choose carefully - after all, a dog is for life and not just a gift to get bored of after a while. ucy and Samuel fall in love with a St Bernard puppy called Snowy - and he certainly lives up to his name, loving to leave pawprints in the snowy garden and help the twins build a snowman. One day, when Lucy has a fight with Samuel and storms off for a walk with Snowy, a blizzard sets in and she gets hopelessly lost. Can Snowy use his survival instincts to lead her back home?