Alan Carlisle, 15, lives on the world's first inhabitable artificial island, New Island, Michigan. Alan doesn't know his father was killed due to his discovery of a gateway to the Otherworld. A forgotten world, the Otherworld was a place of refuge for the old Celtic gods, the Tuatha De Danann. The Otherworld isn't the only Celtic world that has been forgotten. Once a legendary Fomorian begins taking souls from Alan's hometown, it becomes apparent the red door to the Underworld has been opened too. It is up to Alan and his friends, along with the help of two Druids who remained in the Surfaceworld, to cast the kelpie back to hell. Along the way, Alan finds out that not only is he a druid, but he's the reincarnation of the greatest druid to ever live. The Silver Hand.