When Alex finds a beautiful recorder hidden in his parents' attic, strange and wonderful things begin to happen. Wild animals come and listen to him play and injured creatures are healed. Then a door to another world opens, first in his bedroom and then in the woods. Alex and his friend Kate go through the doorway to find a bizarre and often dangerous world peopled by mythological creatures, an alien city and a war that has been going on for decades but nobody knows why or how they came to be fighting or who the enemy is. But there are other humans there too and Alex's parents may finally be able to solve a twenty-five year old tragedy that has haunted them since they were children.