What's most memorable about this picturesque book is its animated trailer that ran earlier this year, featuring a series of evocative illustrations by Chiang, Oscar-winning design director of the ''Star Wars'' prequels. Best-selling sci-fi scribe Card (''Ender's Game'') collaborated on the plot, in which androids try to annihilate all living creatures after a generations-long marital spat that has divided man and machine. Now it's up to an amnesiac human hero and his ragtag band of bipeds to defeat the ''tinheads.'' An assembly line of surprise twists in the final chapters enlivens the pace, but the epic story could be loglined as ''The Lord of the Rings'' meets ''The Matrix'' set on a planet from ''Phantom Menace.'' In this case, the trailer is better than the main feature.