At Animal Ark, Mandy Hope helps her parents treat animals of all shapes and sizes. Even outside the clinic, Mandy can't resist helping any animal in need. It's Christmastime, and Mandy is headed to her Great-Aunt Pip's house for the holiday. Pip lives in the New Forest, an ancient woodland rich with wildlife and fascinating local traditions. Mandy is eager to meet the wild ponies that roam the land, and she befriends a gentle mare and her beautiful roan colt. But as usual, it's not long before Mandy's veterinary knowledge is urgently needed. The Forest can be a dangerous place when it's dark and icy. Can Mandy act in time to save the horses from a terrible accident on Christmas Eve?