"Elidor" is best described as a solid little fantasy story -- it's just not spectacular. While suspenseful and intriguing, it doesn't really have a good sense of the epic or the atmospheric. But author Alan Garner definitely gets points for his subtle use of Celtic mythology and managing to create a believable unicorn.
Four kids exploring a wrecked church accidently venture into another world, the mysterious realm of Elidor. There, young Roland encounters a mysterious wounded man who sends him into a castle, claiming that he can save all of Elidor. After Roland frees his siblings from a spell, the man gives them a stone, a spear, a sword, and a cauldron, and they are sent back to their own world to guard these items from evil forces.
But problems arise when the kids go home and hide the items: The power that they emanate is so intense that it disrupts electricity and radio signals, causing problems all over their town. They bury the objects -- but that's only a temporary measure. The strange situation grows stranger when armed warriors appear near the buried objects, and an Ouija board displays the name "Findhorn" and a picture of a unicorn...
One of the wonderful things about Garner's Alderly duology is that when strange people and things were encountered by our heroes, it made our world seem like almost a parallel universe. It made everything seem magic. That quality is somewhat lacking in "Elidor"; the opening chapters have a promising glimpse of Elidor, but unfortunately this is never exploited. The evil force is another problem; unlike in the Alderly books, the evil is never given a face or an identity, and so it seems a little difficult to really get upset about.
Despite this, the opening and final chapters show Garner's lyrical style, and all of it displays his keen sense of plot development. The descriptions of the electrical disruptions are almost surreal, and his descriptions of Elidor are outstanding. So is his usage of Celtic mythology, though to a lesser extent than his other children's books; the dialogue ranges from chirpy British-schoolchild conversation to the formal language of the Elidor inhabitants. And don't be afraid of the portrayal of the unicorn -- Garner shies away from all the cliches.
It's not really a lightweight read, but "Elidor" is a beautifully written little tale that will thrill fantasy readers. Quite nice.