This is a great adventure for a stormy evening. Just get yourself and your players some hot chocolate, close the shutters and prepare for a good old fairy tale! Depending on your taste you can create a heart-wrenching experience or go for a more light-hearted tone. But the adventure certainly has much potential for emotional depth and tragedy. The 'villain' Mr. Grin has a lot of depth to him and I hope you will have the chance to roleplay him! There is some great potential unless the party attacks on first sight. So you might want to give some leeway if the characters are too battle hungry or set everything up so the party has no chance to attack during the first encounter.
Before you can start you will have to lay out a rough plan on how to structure the adventure, however. There is no step by step walkthrough, which means you will have to study the adventure very closely beforehand to gauge how the 'villain' might react in the given situation.
The design and the artwork are quite pleasing which makes it a joy to read. I advise listening to the Skyrim OST while preparing/playing. It sets the tone perfectly! The map pack which is included offers various iterations of the included map (with a grid, w/o grid, black and white) which is nice!
As of yet, I have not DMed the adventure, but I will update my review once I had a chance to test everything in depth.