First-quantized propagation in quantum gravitational AdS 3 backgrounds can be exactly reconstructed using CFT 2 data and Virasoro symmetry. We develop methods to compute the bulk-to-boundary propagator in a black hole microstate, φ L O L O H O H , at finite central charge. As a first application, we show that the semiclassical theory on the Euclidean BTZ solution sharply disagrees with the exact description, as expected based on the resolution of forbidden thermal singularities, though this effect may appear exponentially small for physical observers. arXiv:1810.02436v2 [hep-th] 30 Apr 2019 1 By the Planck scale we mean an energy scale c 24 ; the details won't be important for this informal discussion. We do not know if a CFT like this actually exists, nor do we know of any bottom-up constraints that make the existence of such a CFT appear problematic.2 Graviton exchanges in n + 1-pt correlators induce mixing between ϕ and n-particle states, so that ϕO n = 0, whereas φ has a vanishing 2-pt function with multi-trace operators. We describe this in more detail in appendix D.10 For a nice pedagogical introduction to the monodromy method, see appendix D of [54]. 11 This holomorphic bulk block can be obtained by taking a chiral limit where c R c L and in particular c R is infinitely larger than all the other parameters that determine the correlator, so that the right-moving stress tensors decouple; it can therefore be thought of as a chiral gravity limit.