Introduction -- Part I. The Plurality of Worlds -- The paradox of measurement -- The emergence of multiplicity -- Chaos, decoherence, and branching -- First interlude -- Part II. Probability in a Branching Universe -- The probability puzzle -- Symmetry, rationality, and the born rule -- Everettian statistical inference -- Second interlude -- Part III. Quantum Mechanics, Everett Style -- Uncertainty, possibility, and identity -- Spacetime and the quantum state -- The directuibs of branching and the direction of time -- A cornucopia of Everttian consequences -- Conclusion -- Epilogue -- Appendices -- A. Proof of the branching-decoherence theorem -- B. Classical decision theory -- C. Formal proofs of decision-theoretic results -- D. Proof of the utility equivalence lemma.