"When demons are free to rule" is a real-life drama about the world-famous Swedish painter Bengt Lindström, who suffered a stroke in 2003, became totally paralyzed, lost his ability to communicate, was put under trusteeship and then unexpectedly had his art treasure worth hundreds of millions of Swedish crowns robbed by his trustee the lawyer Hans-Erik Andersson, his wife Michèle Lindström and later the administrator of his estate the lawyer Bengt Sörman, while the Swedish authorities watched without either reacting or acting.