This is genuinely one of the greatest experiences I've had in 15+ years of playing tabletop games. It produces some astounding roleplay, and the nature of how it works means that everyone finds themselves reaching into emotions they didn't even expect. Discovering the characters together, crafting the pieces of the puzzle at the same time as one builds it, and telling a unique story every single time - all in one single session.
The setting also helps immensely to add to the tapestry players weave on, though I'm a little biased, seeing how the 1717 flood is part of my own family's history too.
This is highly, highly recommended. A must-play for anyone who likes mystery and delving deep into characters, even more so if you enjoy improvising stories.