The Haunted Mask was one of my first Goosebumps books ever as a kid, and was a favorite. I can't even remember how many times I re-read this, but it had been many years since my last reading, and I'm so happy that it held up just as well as I remembered it. To this day, I think it's such an iconic title because it's one of the most genuinely creepy children's books I've ever read. Whereas most Goosebumps books rely a little more on cheese and silliness, The Haunted Mask is such an awful, horrific idea and doesn't really let up once the fear sets in. If you've never read this, whether you're a long-time Goosebumps fan or not, I highly recommend it! (Also, I listened to the audiobook and it's excellently narrated!)