  We revisit the subject of one-loop determinants in AdS$_3$ gravity via the
quasinormal mode method. Our goal is to evaluate a one-loop determinant with
chiral boundary conditions for the metric field; chirality is achieved by
imposing Dirichlet boundary conditions on certain components while others
satisfy Neumann. Along the way, we give a generalization of the quasinormal
mode method for stationary (non-static) thermal backgrounds, and propose a
treatment for Neumann boundary conditions in this framework. We evaluate the
graviton one-loop determinant on the Euclidean BTZ background with
parity-violating boundary conditions (CSS), and find excellent agreement with
the dual warped CFT. We also discuss a more general falloff in AdS$_3$ that is
related to two dimensional quantum gravity in lightcone gauge. The behavior of
the ghost fields under both sets of boundary conditions is novel and we discuss
potential interpretations.
