Very Short Introductions are seldom short, but often brief. However this is a perfect example of how they should be written. It is a very informative introduction, expertly written (unlike many others in the series).
If you are hesitating on whether to buy this on the basis that you may not find it useful, I found it immensely helpful in understanding some of the history behind feminism. It touches on feminism from late 15th century Religious "Feminism" to modern (late 20th century) Feminism. Each chapter is long enough to give you an overview of the main players in the movement like Mary Astell, Mary Wollstonecraft, J.S Mill, Thompson, Reid and many others.
I am a male english lit student and take a more academic interest in the movement but when I started reading this I couldn't put it down, I most-whole-heartedly recommend this to anyone remotely interested in feminism.