It's been a textbook kind of year. Here are some:
Microeconomic Theory by Mas-Colell, Whinston and Green aka MWG. Square, grey and green like dried sick, unprepossessing and dismally hard to struggle through at first. Gradually it's won my heart by its terseness and seriousness. Only what matters is in this book.
Rudin, Principles of Mathematical Analysis. Like all the best maths book, it looks utterly undistinguished, its lurid brown and orange cover like a pair of 1970s curtains. Inside is Proper Maths from the ground up, written in elegant and lucid mathematical prose.
The latest alluring temptress is Real Analysis: Measure Theory, Integration and Hilbert Spaces from Princeton. This hot little minx comes in a shiny blue jacket with some kind of rocket science diagram on the front. Also excellently written, with less notation and more prose than Rudin.
Just arrived: Fudenberg and Tirole Game Theory. We shall see. At least it's a good size. If thrown correctly, it could kill the biggest rat in my kitchen.