New York, Talese/Doubleday. 2000 521 pages. $26. ISBN 0-385-47572-1 BE WARNED. Open the covers of The Blind Assassin and you will enter the broad boulevards, historical mazes, strange alleyways, pitiless personalities, bombed buildings, stinging assertions, and murky certainties of Margaret Atwood's disciplined imagination. Yet you will want to go in there. Readers who dare to explore Atwoodian regions are so numerous, so influential, and so ferocious in their defense of her talent that she has been awarded the Booker Prize, the Norwegian Order of Literary Merit, and Trillium Award, the (Can...