The city of Blackhaven, where the bulk of this adventure takes place, is beautifully and convincingly constructed by the author. It is one of the best and most believable cities created within the FF series. It also appears sufficiently different from any other upon Titan. It feels more like a hybrid of medieval and Victorian London rather than the usual fantasy/D+D style city. As such it feels like a genuine city with colossal and magnificent works of architecture rather than a town.
The adventure exhibits a wealth of influences ranging from classic works of literature to Gothic horror movies. There are elements of Fu Manchu, Phantom of the Opera and Friday 13th, but the biggest influence is the Doctor Who serial 'The Talons of Weng Chiang'. During this the Doctor discovers an escaped war criminal named Greel lurking in the bowels of Victorian London. In this adventure you search in a familiar city for a renegade war criminal named Gruul. Karam Gruul also looks remarkably like Li H'sen Chang from 'The Talons of Weng Chiang'. But using such a Doctor Who story as inspiration for an adventure is certainly not a bad thing.
The adventure keeps the reader entertained by almost being a series of mini quests you must complete to gain information and clues to track down your quarry. These pit you against vampires, grave robbers, insane killers, zombies, demons and a terrifying beast living in the sewers. These sequences are all well written and engrossing with some great characterisation.
It is a challenging gamebook but not overly difficult if you pay attention. There are different ways to track Gruul down so the adventure is quite replayable. The depth of detail, the well realised environments and the variety of intriguing foes means that this is an adventure you will want to revisit.