It's a real shame that books like this have to be written, however as far as books like this go, this one is a decent one. With the subject of hell being "politically incorrect" in today's society, this book brings into clarity just what hell is and what it is not. It show approximately when the idea of hell began to decline in mainstream theology and it also makes very good arguments as to why annihilation and universalism do not work.
The best chapter in my opinion was the one that they show what Jesus said about hell and what exactly hell is and what it isn't. After all he did spend a lot of time teaching about this subject. I also enjoyed the chapter that Timothy Keller wrote on preaching/witnessing about hell. I found that there were several practical tips that I might be able to use.
The down side, the book lost me in several places because of a variety of reasons, but I was usually able to pick up the general meaning. The other item is that the book is only 83 pages of actual text.