When parents look at the beautiful covers adorning the gift-boxed sets of Philip Pullman's fantasy series, His Dark Materials, they might be forgiven for believing that these books follow in the tradition of J.R.R. Tolkien's Lord of the Rings or C.S. Lewis' The Chronicles of Narnia. In fact, the publishers are counting on it. The display tables have arrived just in time for Christmas and the release of the screen adaptation of the first volume: The Golden Compass.What Pullman's promoters desperately hope is that parents will not get beyond the colorful covers, which appear to depict nothing more than an...