This is about the 8th or 9th pre-made adventure that I have slotted into my larger, ongoing, campaign now. And, I must say, that of all of them this was by far the best to implement.
The document itself is well organised. The background information necessary for the DM is all upfront, images and stats at the back and a clear progression through days/ chapters on the journey. It's planned out in such a way that the party are free to travel to any location within this contained city and the DM has multiple layers of information they can provide towards the overall mystery.This is the great part for new players, as it helps them to overcome the videogame mentality of 'exhausting dialogue options' then moving on. It promotes in them the idea that people can be played off against one another, brobed, made to trust etc.
The mystery builds and climaxes in a satisfactory way. Though, my one warning is that this is designed as a one-shot and therefore the end battle is not necessarily one that you expect the party to walk away from. It does mention this in the adventure, but in trying to fit it into my own world I did find that my party of three level 5's felt like they were underpowered against even the soldiers - who would have AC's of 20 in some cases. They made it through in memorable fashion, but there was some beatings along the way.
I highly recommend this. It's well thought out and has room for humour, horror and mystery all in one.
[5 of 5 Stars!]