At the Vienna Art Academy in 1994, an unidentified person painted over 27 works by Austrian painter Arnulf Rainer. Rainer had become world-famous for his abstract art and, in particular, for his over-layering of photographs and overpainting of his own and other artists’ works. But who painted over the “overpainter”? Speculation rages: Did he attack his works himself? A year later, an unsigned letter surfaces claiming responsibility for the act directed against Rainer – and modern art in general ...