Module cover has areas of wear, it is covered in a duraseal type material. The interior pages are all present however the illustration pages have been separated and cut into singular pages most likely so they could be passed to the players without handing them the whole module. There is no staple on the other pages, easily fixed with a new set. Some marks and wear on the interior pages.
Tomb of Horrors is a 1978 adventure module for the Advanced Dungeons & Dragons roleplaying game, written by Gary Gygax.
The Tomb of Horrors is infamous among players of the game as a "killer dungeon," filled with all manner of extremely deadly traps and monsters that are capable of easily wiping out high-level parties of player characters.
The plot of the original module, such as it was, was a simple dungeon crawl; the evil demilich Acererak was said to linger on in his ancient tomb in undead form, and the characters were to fight their way down through it to the demilich's inner sanctum to slay him once and for all.