''This is a true story. It was told to me by Mike and Kathryn Tickell. Kielder Water is the largest artificial lake in the UK. It is in North Northumberland, a wild and beautiful place, rich in folk music, story and legend. It was created in the late 70s and early 80s. A great dam was constructed across the Kielder Valley, a place of farms, a school, several homesteads and a stretch of the Border Counties Railway. The valley took two years to fill with water. Kielder is now a place for walking, fishing, boating. It is part of the Northumberland International Dark Sky Park, the fourth largest in the world.''--David Almond, postscript.