NEW YORK—Harry Potter fans throughout the world were shocked, disappointed, and outraged to learn last week that J.K. Rowling's 750-page novel, Harry Potter and the Deathly Hallows, blatantly answers every looming question in the 10-year-long saga, even going so far as to divulge what happens to key characters 20 years into the future.

"The whole experience is completely ruined for me," said 25-year-old fan Ethan Clay, adding that the book builds up suspense, and then, without warning, gives away vital, plot-altering information. "The least [Rowling] could have done was put a spoiler alert or something on the front cover."