You might think that a writer best-known for novelizing the movie "E.T." would find a satire on the book publishing industry hitting a bit close to home, but William Kotzwinkle seems quite comfortable with the task in this comic fable. In Kotzwinkle's merry send-up, the author of the hit novel "Desire and Destiny" is a bear, a real bear, who after finding the manuscript under a spruce tree and attaching his nom de plume, Hal Jam, becomes rich and famous overnight. Obtuse editors, star-hound agents, and a right-wing televangelist and Presidential candidate all warm to Hal's warm, bearish honesty without bothering to read his book--or to notice that he's an animal, for that matter. It's an old gag turned by a canny author to amusing, if not always compelling, purposes.