More of a campaign setting than an actual adventure, this feels like the starting area and base for what will be coming in T2, only in 1979 you’d have to wait 6 years for T2, The Temple of Elemental Evil, to actually come out. 

So you get a small village setting with every inhabitant, house and business described, with plotters and envoys of the evil temple as well as druidic forces and the lawful good followers of Greyhawk’s St.Cuthbert as a setting for your adventure. There aren’t really that many sidequests or things to do in the village except to understand the dynamics of the powers in the area. Some of the buildings, such as the inn, the church and the tower have detailed maps and more stuff going on in there. This is also an excelent setting for murder hobos as you get to know every little cent and bit of equipment that each innocent farmer has on the house or on his person, kind of rewarding the players for razing the town.  

There’s a small dungeon outside the town, an old Moathouse, full of all kinds of beasties and giant bugs and also some bandits and gnolls and such. However, unlike in modern adventures there is no hand holding here. There are no quests in the village directing you to the moathouse, no one even mentions it. You kind of have to guess. So it’s a little sandbox module but a really important one, although the “small village starting area for low lvl PCs” might seems like a cliché today (as with Phandalin in the Starting set for 5e, for example), this is the very first time you get that. The start of a D&D staple. Now, only 6 years to go to actually get to the Temple of Elemental Evil.