Landslayer's Law (David Sullivan #8)

The World Walls separating the "real world" from the alternate world of Faerie are becoming so thin that Faerie can now be seen in satellite photographs. As craven mortal land developers threaten to exploit the magic lands, David Sullivan finds that it is up to him and his friends to prevent the High King Lugh from implementing his "final solution" to a most vexing problem—humankind.