Meet Archie - a 10-year-old boy from a very ordinary family, who lives on an ordinary street and who goes to a very ordinary primary school, but he has an EXTRAORDINARY grandad! Archie's mum and dad are busy working parents who try hard to juggle their working lives and the commitments of family life so Archie and his sister, Sophia, get to spend a lot of time with their grandparents. Time spent with Grandad is always full of stories, adventures and fun! Archie's a different person when he's with his grandad. If only there were more school holidays each year!

Archie had had the best time ever with Grandad in France during the summer. Now he was full of confidence, proud of who he was and the local French cycling champion! When he returned to school, he was determined to make a difference. Life was good... then Mum had an accident! No worries... Groovy Grandad comes to the rescue and another adventure begins.

Archie, Pascal and Sophia delve into the past and bring one of Claudine's tales to life when they discover the story of Pierre's life during the second world war. Grandad and Maurice uncover Pierre's whereabouts but little did they know that what they had discovered would become something special; something very special with the aid of some Grandad Magic. Pierre becomes a well-deserved hero. Archie gets quite a surprise when he delves into the past to discover Grandad's story from the war years! After all, not everyone has a Grandad quite like theirs.