Bertie is alone, devastated after his beloved sister and fellow beagle Molly is adopted, leaving him behind. When Bertie is taken in by the Green family, it seems he's finally found a place to call home ... Yet Bertie swiftly realises that the kind and loving Green family is in crisis. After a tragedy two years ago, they've never recovered - and as Christmas approaches, grief is pulling them apart. Never has a four-legged friend been more in need - and brave, warm-hearted Bertie must rise to the challenge. Can he find Molly and bring the Green family back together again ... all in time for Christmas?