Celebrate the 40th anniversary of the miniature world of the mice of Brambly Hedge! It is the very end of autumn and Flax and Lily are busy making blankets for the voles in the High Hills. Mr Apple has to deliver the blankets to them before the cold weather sets in and Wilfred Toadflax is eager to go along. He is convinced there is gold to be found in the hills beyond Brambly Hedge and this is his chance to discover it. Everything goes to plan until Wilfred scrambles up a rock face and can’t get down. The mist begins to rise and soon Mr Apple and Wilfred are engulfed in a thick white fog, unable to find their way home…