This is a nice little introduction to logical thought, which is in itself none too taxing. After reading it, you'll be spotting logical mistakes in no time. However, as noted by a previous reviewer, Whyte does go on about religion quite a bit, which to my mind is the weakest aspect of the book.

The main problem is that he never really goes very indepth (which would have been interesting), preferring instead to take pot-shots, and then move quickly on. His assertion that there can't be an all-powerful God if evil exists is particularly poor, presented as it is without any sort of discussion about what "all-powerful" means (many if not most Theists do not believe God to be "all-powerful" in the way Whyte suggests), or what "evil" means. Instead, he blithely states that people who believe this have been "convinced by one of the many bogus theological attempts to show this belief consistent with the existence of evil", and then pretty much leaves it there. This, and Whtye's other attacks on religion are generally straw man arguments, and so are bad form for a book on logical fallacies. Admittedly, the book is short, and so it would be hard to give a detailed examination of the religious themes, but this is the very reason the book would have been stronger without them; if when writing a book on logical fallacies you can't mention something without it sounding like a logical fallacy, you should probably not mention it at all.

Still, Whyte is frequently humorous, and he does write in a lively, engaging style. If you don't mind putting up with Whyte's personal religious opinions being presented as gospel (pun intended), I'd recommended this book as a good starting point, with the proviso that those interested will progress to something a bit more substantial.