The Bane of Aelin's Tomb is the first episode of the Doom Sword of Andulyn series.
The book gives an overview over the world of Annwynyn in which the series is set, including campaign-specific races and classes.
The adventure itself starts with a dying man handing over his sword to the characters. They are asked to bring it to the Duke of Ulstor. The first part of the journey leads into a mini-dungeon.