The Grand Design: Episode 1 - The Caliberi Letters

From publisher blurb:

The War of the Cross nearly destroyed Théah. In the end, nearly eight million people died. But what many do not know is the secret reason behind the War…

The Caliberi Letters is the first part in a series of adventures called The Grand Design, which reveals this secret truth to your Heroes. What begins at a wake for a friend
— Magda Müller — turns into a desperate chase to expose the Villains who burned Théah to the ground for their own personal gain.

You can play this adventure with Heroes from any Nation, although a Hero with Hexenwerk can provide an advantage when it comes to dealing the dead.