I have come across a series of very short introductions By Oxford University Press. These SHORT INTRODUCTIONS are for anyone wanting a stimulating and accessible way in to a new subject. These are 100-page short books that you people can read one per day.
Oxford University press has printed the following titles in this series:
1.Prehistory
2.Post colonialism
3. Globalization
4. sociology
5. Art history
6. World Music
7. Psychology
8. Literary Theory
9. machiavelli
10. Democracy
11. Empire
12. Linguistic
13. Architecture
14. Terrorism
15. Emotion
16. fascism
17. Capitalism
18. Aristotle
19. logic
20. politics
21. Evolution
22. Philosophy.

The price is around 250 per book. I have purchased "POLITICS" and its a very interesting and informative read.