The worst book I've read in this series - frustratingly vague and gnomic. In a short introductory book for newbies, you really need to make sure every sentence has clarity and purpose. Instead it was frustratingly difficult to work out what Horrocks meant at times. I also feel the book would have worked better if it had focused on a few key ideas and explained them clearly rather than whizzing through his books chronologically. Not sure the illustrations add much either.

I came away from the 'Introducing' book on Derrida (who is famously complex, and who I've never read anything by) with a clearer idea of his work. In contrast I've read some Foucault and struggled with this.

Edited to add - if you're looking for a good, brief overview of Foucault, you're better off doing what I just did and googling the Stanford Encyclopaedia of Philosophy entry. Sweet sweet clarity.