Describe symbolism in Poirot Investigates by Agatha Christie

In Tragedy at Marsden Manor, Poirot compels Mrs Maltraverse to confess by staging Mr Maltraverse's ghostly appearance. He smears red paint on his hands that incites his wife's admission of guilt. The psychoanalytical approach of first employing word association to reach the subconscious and then provoking the unleashing of repressed memory to unveil murder mystery was effective. The symbolic manifestation of hidden thoughts and desires creates suspense that is resolved after Mrs Maltraverse confesses. Poirot often engages tactics of exploiting the release of what's hidden in the unconscious.