This neat adventure is just the sort of thing for a party of low-level adventurers to enjoy as they build their reputations as people to turn to in times of trouble. The people of a remote settlement called Glenn Hollow fear they have upset the 'Barrow King', a supernatural being they believe lives in ancient burial mounds not too far from the settlement - and they hail a bunch of adventurers as a welcome source of aid.
The work opens with a DM Background which lays out what is actually going on and a brief Adventure Summary which boils down to 'Go and fix the problem'. Notes for finding a suitable location for Glenn Hollow in your own campaign world are provided, and then it's on with the adventure itself.
It's assumed that the party is on the road one autumnal evening when they arrive at Glenn Hollow. Just why they are in that area is left to you to determine. The village elder lays out the problem and asks for help, and it's off to find the burial mounds next morning. There's very little description of Glenn Hollow, so if the party wants to hang around and talk to folk you will need to invent something. The area of the burial mounds isn't mapped either, although there is a good map of the Barrow King's tomb and what lies beyond... the associated descriptions are clear, and brief details of the denizens and how they'll fight are provided. Everyone that the party encounters wants to fight to the death, there is no scope for any kind of interactive save a dialogue of steel and spell.
There is a new creature, a construct called a chirurgeon, and a new magic item - a greataxe called Fiend infused with chaos - introduced here, and there's a little bit of mundane treasure to be found if the party has time to go rummaging, but the real reward is the virtuous glow of having got rid of something quite evil, and of having rescued some villagers too. A few notes are provided on directions further adventures might take.
Overall this is a simple but neat 'delve' adventure which shouldn't take more than a single session, best used as a sidetrek in your campaign or a standalone adventure when the group is in the mood for some hack and slay adventuring.