This first feature by Franco-Greek director Costa-Gavras was adapted from a novel by Sébastien Japrisot and is a humorous, visually punchy take on the murder mystery. Six people share a sleeping compartment on a Paris-bound train. After they arrive, one of them is found strangled, and before long, the killer starts bumping off the remaining passengers. Yves Montand is superb as a harried police inspector coming down with the flu, who doggedly follows up every lead. Red herrings abound and the twists and thrills are masterfully executed with a dream cast including the late, great Michel Piccoli who died earlier this year.