  Misner spacetime is among the simplest solutions of Einstein's equation that
exhibits a Cauchy horizon with a smooth extension beyond it. Besides violating
strong cosmic censorship, this extension contains closed timelike curves. We
analyze the stability of the Cauchy horizon, and prove that neighboring
spacetimes in one parameter families of solutions through Misner's in pure
gravity, gravity coupled to a scalar field, or Einstein-Maxwell theory, end at
the Cauchy horizon developing a curvature singularity.
