Bertie is all alone: his beloved sister and fellow beagle Molly has been adopted, leaving him behind. But when Bertie is taken in by the Green family, it seems he's finally found a place to call home. Yet he 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 Day?