Keep on the Shadowfell (2008)

From the publisher's website:

An introductory 4th Edition D&D adventure for characters of levels 1-3

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 an exciting Dungeons & Dragons adventure designed for characters of levels 1–3. It includes three double-sided poster maps suitable for use with D&D Miniatures.

From the back of the adventure:

Near the sleepy town of Winterhaven, a ruined keep overlooks a dormant gateway to the otherworldly realm knoown as the Shadowfell. Though this dark scar on the world has lain dormant for many years, an evil cleric of Orcus, Demon Prince of Undead, seeks to reopen the gate. The only thin preventing the forces of darkness from sweeping across the land is a determined band of heroes...

Contents: 80 page adventure book, 16 page 4th Edition quickstart rulebook, 5 ready to play 1st level characters and three double-sided battle maps.