Happy Holidays From Dead House was intended to be the second book in the Goosebumps Gold book series. It was going to be released in the year 2000, but it was not written or published because of R. L. Stine's contract ending with Scholastic. The book was going to be a sequel to the Goosebumps book, Welcome to Dead House.
The plot was unknown, because the book was not written. The plot was most likely about the Bensons (from the 1st book) or another family traveling to Dark Falls during Christmas and encountering the undead.
Despite not being published, Tim Jacobus made a cover depicting the door to Dead House covered with Christmas themed items like a Christmas wreath resembling a skull with a mysterious glow coming from inside the cracked open door. The cover can be seen here.