Here is a detailed review of Bookhounds by Lowell Francis over at RPG Geek. One point the reviewer raised was of particular interest – he mentioned that he was expecting more Armitage Files like handouts, and guessed, correctly that the Occult Guide will fulfil this role. If you want to run a player driven occult mystery set in the London in the style of Armitage Files, hand the players the Occult Guide and let them get on with it.
I don’t think I’ve ever read a gamebook which so carefully integrated the character of the city with the character of the play. It is an imaginary London, but one vivid and playable … Bookhounds could obviously be easily used by a traditional Call of Cthulhu GM and I’d recommend they pick it up. Anyone with an interested in London or England in the first half of the 20th Century should consider it as well.