More than 65 years after he first learned the magic of Christmas, the Grinch's story will be expanded for the first time without Dr. Seuss in a sequel book titled 'How the Grinch Lost Christmas.' https://t.co/zv2PDm4zrw
— Entertainment Weekly (@EW) February 23, 2023
Set one year after the events of the Grinch's infamous Christmas caper, How the Grinch Lost Christmas will see the curmudgeonly creature eager to prove to all of the Whos that he's fully committed to the festive spirit. When his plan to win the Who-ville's Christmas Crown goes awry, the Grinch nearly turns his back on the holiday before "one small, special Who reminds him that Christmas is not about winning," according to a press release. Its cover also appears to feature the Grinch's pal Cindy Lou Who.
This is the first, and so far, only Seuss novel written after his death, without his input (probably).
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Sounds like Nightmare Before Christmas to me.