The introductory adventure for D&D4E, released a month before the rules.

The town of Winterhaven stands watch over a ruined keep that was once a bastion of good in the realm. This keep overlooks the Shadow Rift, a dark scar in the world that was once a gateway to the Shadowfell but has been dormant for many years. Now, an evil cleric of Orcus, Demon Lord of the Undead, seeks to re-open the gate, and the only thing standing in his way is a small yet determined band of heroes.

Keep on the Shadowfell is a Dungeons & Dragons adventure designed for characters of levels 1–3. It includes three double-sided poster maps suitable for use with D&D Miniatures.