Margareta (played by Lina Romay) is on vacation at the Swiss/Italian border and meets the charming Sandra Mauro (played by Monica Swinn) and her husband. She agreed to stay at their home for the rest of the vacation, unaware that they would use her to smuggle diamonds at the border. There, they got to know each other a bit "deeper", but one night, she was awakened by strange noise and found that the couple had been brutally killed in the living room. Margaret was deeply traumatized and unable to speak, and was sent to Dr. Antonio's shelter. Antonio tried his best to make her speak and expose what happened on that terrible night. His attempt was not selfless, as every healthcare worker attempted to be the first to discover where the missing diamond was hidden. One night, a mysterious black robber killed a nurse. This is just a random attack, and there are still people trying to get rid of potential competitors. Only Margaret, who saw the murderer and could uncover the mystery