This book does what it promises - Mr. Cantwell provides plenty of information, instruction and inspiration to monkey with your homebrew IPAs. His advice is thorough and non-prescriptive. Through helpful lists of potential ingredients, he gives you a hint of what to expect IF you employ a particular fruit, spice, herb, vegetable, tea, coffee, etc. in your brew but does not tell NOT to use any of them. Horseradish? Mace? Dill? This book may be most helpful of all to those maniacs who are thinking of tossing cardamom in their IPA without thinking through the consequences.
Mr. Cantwell's book is more of a conversation than you would expect. Rather, it is like a conversation about 3 beers in with an effusive friend who talks too much, and goes down conversational paths that are completely unnecessary but fun enough unless you're in a mood. If his editor had paid any attention whatsoever, the book would have been a longish pamphlet, but, instead, we are treated to this sort of thing (I swear I opened the book to a random text section and started copying what turned out to be his thoughts about sourcing ingredients, and he happens to lapse into a revery that is mostly focused on the concerns of professional brewers): "Well once more the world has changed. And yet, it's still about relationships. Without address books, even the Rolodex, has gone the way of the pteradon, not to have some kind of comprehensive list of contacts for the sourcing of specialty ingredients is to pretty much takes one's self out of the game where the crafting of new and innovative beers is concerned. The upside is that these days there are people out there, and the specialty companies they they work for, ready to do their best to get you what you need in whatever form you need it. And once you make their list as somebody habitually enquiring about the new and unusual, they're also likely to tip you off once something interesting creeps into the market. Larger craft breweries have people, even sometimes whole departments, dedicated to the acquisition of specialty ingredients, often writing contracts to ensure ongoing availability and specific source parameters. The brewers at such pioneering stalwarts as Anchor and Sierra Nevada didn't spend a minute during their early days sourcing such esoterica, but I assure you they do today. Good luck with all that Brazilian stuff, by the way."
Speaking only for myself, I am a willing verbal wanderer, so I'm happy to ride shotgun on his meandering path, but if you have a literary Reinheitsgebot law, this guy is going to drive you fucking nuts. But you will still be glad to have the book for its advice and thoughtful lists.