Honey and I crawl through the dismal Dartmoor landscape, drained and limp with the fog that has smothered us all day. As we descend into the Dart Valley our view is suddenly brighter. I look up and see a patch of blue appear through parting clouds. Plum, Honey and I climb into a watery world illuminated like a Medieval bible. We swim against the chill current and bathe in sunbeams which reflect and ripple across the rock face above us like a river of light.