I'm afraid that this is the first product in the Freeport line that was underwhelming to me. Promising a look at the dark underside of the city through it's strange cults the book instead offers eight cults that follow the most basic stereotypes of any fantasy campaign. There's a berserker cult, a cannibal cult, an S/M fetish cult and so forth. The best cults are those that tie to the setting directly (the Serpent People cult of Yig, the horrors of the Unspeakable One, the God of Evil Pirates) but they are not enough to lift up this product's rating.
I hope future releases push the Freeport setting more interestingly than this book.