On a little street in a big city, everything is changing. Bill has lived on Christmas Street since he was a young man. He's seen families come and go, watched children grow up... Now he wants to be left alone. Everything eight-year-old Teddy loves is in America. But his widowed father, Sam, has brought them both back to England to be closer to their family. Sam's one wish is for Teddy to be happy again. As Teddy and Sam settle into their new life, and Sam has an unusual meet-cute with the delightful Libby, a very special four-legged neighbour is determined to make them feel at home. Jack, the Christmas street dog, is welcome in everyone's house - but will it be in his power to help a little boy and a lonely old man remember the true meaning of the season? As the snow sparkles on the ground, one small act of kindness will give a whole street a happy Christmas.