(Note: I was asked to help proof read and give feedback on a beta version of this adventure, but I have no professional or personal connections to the dev or this product.)
An absolutely fantastic little adventure with some incredible art and a solid little mystery story that could be played just as easily for horror as heroic fantasy.
The only real downside and it is worth noting is that the system agnostic nature of the adventure means it cannot be run straight out of the book without additional prep by the game master since unique abilities and monsters do not have pre written stats or rules. This should not be a huge issue for an experienced GM and if your looking to run this using a system other then D&D or Pathfinder the lack of hard rules can make it a little easier to fit into whatever system you use, but just be aware that the book will require some pre session homework.
Having said that, I fully intend to run this game at my own table as a side quest, removing some of the wider world lore to fit it into my on going high seas pirate adventure as the tale of this doomed family is just as compelling in as out of its intended setting!
In short, I recommend it and I think the dev should be very proud of his work!