A thriller where reality is distorted to the point of questioning the mental state of the characters, who become immersed in a deadly game of appearances and suspicions. An idyllic weekend amidst nature turns into a nightmare stained with blood when one of them is brutally murdered aboard their yacht. Lakes and forests are the setting where Detectives Trevor and O. will have to find the clues that vanish like a dense fog, making them doubt the reliability of the witnesses and their alibis. Time is running out. Who did it, and why?