I was very disappointed by this book. The secret world under London's streets is a potentially fascinating topic but this book contains little of that fascination. Most of it consists of chatty descriptions of guided tours taken by the author, right down to the inconsequential conversations he has with the guides. It reads like an overextended piece for a colour supplement, with very little in the way of interesting information and an awful lot of filler. If you're interested in London, there are many better books to spend your money on.