This is a reprint AND conversion of basic D&D modules In Search of the Unknown and Keep on the Borderlands. There are two classic version of each module, fifth edition versions, hints for new Dungeon Masters, and things of that nature. I lightly skimmed the adventures but there are about 25 pages of background on the creation and history of the modules that I found fascinating. I'm not sure how well the conversions will play but I've had a lot of fun skimming the book so far.