It is rather concise. Basically, he outlines a plan that is affordable and doable with current technology.
He concludes his book with a philosophical argument. It is somewhat reminiscent of President Kennedy's speech at Rice University in support of the Apollo project that sent men to the moon and back.
Update:
Part of the reason I got this book is to study Zubrin's ideas for generating methane. There are two basic ideas, and one of them requires no methane to be generated at all. It will be brought along.
The one idea for generating methane on Mars is to use a 100 kilowatt hour nuclear reactor. That pretty much answered my question. You need energy, but how much? Apparently, a lot.
However, this is not a show stopper as the methane can be taken along and the lox generated on Mars will save plenty of mass.
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