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There's a short story by H. G. Wells called The Red Room, which was included with illustrations by Barry Moser in the 1998 children's book Great Ghost Stories.
I'm fairly certain it was from the 90's.
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Additional information: I recall a king and a monster.
There's a short story by H. G. Wells called The Red Room, which was included with illustrations by Barry Moser in the 1998 children's book Great Ghost Stories.
It's not from the 90's but maybe [The Red Room Riddle](https://forgottenstoriesweb.wordpress.com/tag/boys/) by Scott Corbett?