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In the beginning was the worm
Brown is a journalist, and writes as someone reporting on the science rather than someone who was involved in doing it. I felt that this led to him standing back from the action too much and losing the thread of what was going on. But the book did well in portraying the lives of scientists working on C. elegans, and in particular the three 2002 Nobel prize winners, John Sulston, Bob Horowitz and Sydney Brenner.
For those wanting to go further the book has only a short section of sources, with a web address for further references -www.thewormbook.com/refs - but unfortunately this doesn't seem to be there.