There's a number of problems with this book. First and foremost, it's not a guided tour, but mainly just proofs for everything the two authors believe, and dismissive claims against everything they don't. The book is overpriced for its slim size, and while styled as a gentle introduction for beginners without terminology, I had trouble even following arguments I already understood. Instead of lacking terminology, they would give bizarre labels to propositions like Srii11, without an explanation of what exactly the S, r, and i stand for (the 11, at least, was obviously due to it being the 11th statement...).
Moreover, the book is annoying. In the discussion of the cosmological argument for God (also known as the first cause argument), which roughly goes, "Everything effect we know of in science has a cause, therefore there was a first cause, which must necessarily lie outside of science.", they hand-wave / dismiss the claim that everything in the world has a cause thus proving the arguments invalidity, and later on casting serious doubt on the existance of God because of this proof of its falseness.
The problem, of course, is that in two other chapters, in which the authors are arguing against, say, Free Will, they take it as an immutable law that everything in the world has a cause and an effect.
There are good arguments against the Cosmological Argument for God, but they don't use them, instead basing their argument on a claim that they flat out claim is false in other chapters. There's at least one blindingly wrong argument the authors make in every chapter of the book. So reading the book with any level of critical thinking makes you just want to hurl it across the room in disgust.
I'd recommend Labyrinths of Reason insead.