水手屍體被沖上岸，現場無人證也沒有死者漁船的蹤跡，李奧警探負責追查兇手，但漁村裏沒有人願意談論這件事，使調查陷入困境，直到出現令人意外的關鍵證據。

一名神秘的連續殺人犯，讓城市裡的富裕階層備感害怕，犯人殺害藝術收藏家後，會利用他們的屍體重現哥雅知名畫作中的場景。卡門是一位經驗老到的調查員，但對自己的人生感到厭煩，伊娃則是她身邊的年輕助手。兩人要從沒有留下線索的犯案現場，找出這個心思縝密的殺手。

The plot introduces us to a psychologist who suggests to three couples that they engage in a group session, where they will have to analyse each other without her being present. In order to do so, she has left them a number of envelopes containing instructions on the things they have to address. The method she has proposed encourages everyone to share their opinions, argue with...