This book has a familiar feel to it like it was one I read and enjoyed when very much younger, it tells the tale of three siblings, a girl and two boys, who do battle with their own fears and the magic of another world to save that world and to keep evil at bay in this. It has echoes of cold war running through it and a fewar of a total war to end all wars.
One to be sourced to enjoy over and over, it was lucky it made it back to the shelf.