A psychological noir thriller set in 1960s New York based on Patricia Highsmith's novel 'The Blunderer'. Walter Stackhouse is rich, successful, and unhappily married to beautiful but damaged Clara. His desire to be free of her feeds his obsession with Kimmel, a man suspected of brutally murdering his own wife. But when Clara is found dead in suspicious circumstances, Walter's string of lies and his own guilty thoughts seem enough to condemn him. As his life becomes dangerously entwined with Kimmel's, a ruthless cop is increasingly convinced that he has found a copycat killer in Walter and aims to nail both murderers.