At the Bastille Day parade in Paris, a deranged gunman, Max, is foiled in his attempt to kill the French President. Detective Mazarelle believes he is experiencing mental issues, and dispatches him by ambulance, thereby sealing Max’s fate. Further down the Seine, a boatman notices a body hanging upside down along the river, clearly a homicide, Are the two situations connected? Will Detective Mazarelle be able to piece together the puzzle in time to avert another murder? This is a very intriguing and thrilling French mystery!!