This is a fairly fun adventure. Or it might just be because 4-1 and 4-3 were so horrible that my expectations has dropped significantly.
Nonetheless the hook to the adventure is so much better. The final boss fight is a little too easy in my opinion, and the manor shouldbe a little more deadly to bring the crippy and horror feeling.
I personally added a little twist to force the adventure forward after the first part because some parties I've DMed for aren't too bothered about what happened. [SPOILERS]
So the initial hooks is good enough. A simple missing person and someone offers you some gold to check out the path the missing person took. Things happen you meet Glovia the main healer of the village who you wll later find to be the main villain.
I've noticed some groups aren't bother by Glovia kidnapping Sorina to bring Isabella back to life.
There is two way I use to solve this. During their vision, make Isabella be friend one of the character (remove the spectacles) and give that character more information that Glovia is up to no good. However is has backfired before, the character not actually believes Isabella can come back to life and wants it to happen.
The other way is to make one of the character get love stuck by Sorina. So when she is kidnapped that adventure will convince everyone else to march towards the manor.