MONTREAL—Yann Martel, author of the Booker Prize-winning Life Of Pi, said he was distraught to see what other books Amazon.com customers bought in addition to his. "Customers who bought this book also bought The Five People You Meet In Heaven?!" Martel read from his computer screen Monday. "And The Rule Of Four? Really?!" Martel was also surprised by the "sloppy writing" in many of Life Of Pi's five-star customer reviews.