 Placek (2004) understands quantum state holism as involving a thesis about probabilities: that the probability of a joint result of a combined measurement on a pair of entangled quantum systems is not determined by the probabilities of the two results. But he takes this to be only one ingredient of a more complete conception, whose formulation and analysis requires a modal framework combining indeterminism, (rudiments of) relativistic space-time, and probability—Belnap’s (1992) theory of branching space-times.