Animals always come first for Mandy Hope, and at Animal Ark - her parents' busy veterinary surgery - Mandy is always making new friends.
It's Christmas at Animal Ark and Mandy and her best friend James have a fantastic idea - a party for all the pets in Welford. But festive plans are put on hold when Mandy discovers Tess, a wounded stray sheepdog who seems to have a dark secret. Can Mandy save poor Tess's life?