From the back of the book:
A gathering of souls” consists of a set of quick-start rules and an introductory scenario for Ambrosia that is meant to be played by a game-master and three to four players using pre-generated characters. Only the quick-start rules included in this book are required to run this scenario.
The noble houses Baligant and Tauernier have been bitter rivals for centuries. When a child of Tauernier is born on the soil of house Baligant, however, a political marriage is arranged to build a bridge between the two families. As this child has now come of age and the marriage date draws near, dark forces awake in the ancient woods of Ketendal from a years long slumber.
For this Tauernier was born during a terrible storm, resulting in the destruction of the Baligants’ castle Valanthil - and history seems to be repeating itself. As a new storm rages through the region, buried secrets that might pose a threat to the fragile peace between the two houses are bound to resurface...