From the publishers blurb:
A long time ago, an ancient civilization inhabited the world. Nothing is known about them, except for the ancient scriptures that they left. They used an ancestral dialect, which was forgotten, along with themselves. Some powerful wizards who researched ancient knowledge, know how to speak and read this language, because they believe that they possessed enormous magical knowledge. Popular belief says that this civilization ceased to exist overnight, simply disappearing. No one knows how, no one knows why. Many believe that this civilization was transported to another dimension by means of very powerful magic, and whoever manages to find out how to find it, will probably have access to all this knowledge, in addition to countless riches.
The Heart of the Misty Island is an adventure compatible with SS&SS from Diogo Nogueira.
Originally, this adventure was planned to be played as a one-shot at the 52nd Encontro D30 de RPG, but after some advices and thinking I decided to rewrite this to be a larger adventure, to be played in maybe 2 or 3 sessions.