The Hammer of Thor

'The Hammer it is lost to Thor...' During a second Gulf War, two children, Arthur and Guinevere, have come to stay with their grandparents in Ilkley. They discover that the Town Mayor, Albert Lockey, who is, in fact, Loki, intends to ruin Ilkley Moor by development on it. They also are told the legend of Giant Rombald walking between the two outcrops of Almscliff Crag and the Cow Rock, breaking off the Calf and his Wife dropping a Skirtful of Stones on the Moor. The children discover a set of riddles, which enables them to find both a Cup and a Ring on Ilkley Moor, and they, in turn, wake up ancient magic surrounding the ancient cup-and-ring stone carvings on the Moor. The magic helps them find Thor's Hammer, which has been hidden from him on the Moor by Odin. They meet Thor, who tells them they must get the Hammer to Almscliff Crag by sunrise. The local Police are in league with Loki and capture the Hammer. The children have only that night to get the Hammer back from Loki, and, avoiding the Police, get the Hammer to Almscliff Crag and defeat Loki...