Nigel Warburton's A Little History of Philosophy. Cathcart and Klein's Plato and a Platypus Walk Into a Bar. Both are easy-going and fit the description of an o

Nigel Warburton's A Little History of Philosophy. Cathcart and Klein's Plato and a Platypus Walk Into a Bar. Both are easy-going and fit the description of an overview. Further reading can be segued to Oxford University Press A Very Short Introduction Series. Concise but in-depth reads written by modern philosophers.