  We present a plausible counterexample to cosmic censorship in four
dimensional Einstein-Maxwell theory with asymptotically anti-de Sitter boundary
conditions. Smooth initial data evolves to a region of arbitrarily large
curvature that is visible to distant observers. Our example is based on a
holographic model of an electrically charged, localised defect which was
previously studied at zero temperature. We partially extend those results to
nonzero temperatures.
