Stoicism for the modern world, death to the self-help book industry, and a healthy scepticism towards social media.
Happy: Why more or less everything is absolutely fine by Derren Brown is superb. It’s beautifully written, wonderfully observed, both philosophical and practical (which once upon a time were one and the same thing). Very thought-provoking.
I think I first heard of Happy from a Donald Robertson interview and it treads similar ground to How to Think Like A Roman Emperor. However, it does so in a completely different way.
I particularly enjoyed Chapter 5, A (Very) Brief History of Happiness.