Axioms is "the last book on metaphysical philosophy you'll ever need to read". It uses the latest methods of bayesian analysis to prove that philosophy is bullshit.
Instead of being the end of all reason, this proves to be the proper beginning. It establishes once and for all that the most important free choice any human makes is their choice of what to believe, their axioms. Axioms are, in fact, the basis of all understanding, all knowing, but themselves cannot be known, only believed.
The book connects these conclusions of western mathematical philosophy with the heart eastern philosophy in the form of Zen Buddhism, with axiomatic set theory, with Hume's skepticism, and more. It is written to be fun to read and accessible, even as it presents its core arguments fairly rigorously.