It's a thin line between 20th-century Nazism and 21st-century corporate culture in Heartbeat Detector, Nicolas Klotz's rewardingly chilly psychological thriller. Mathieu Amalric (The Diving Bell and the Butterfly) plays a staff shrink at the Paris branch of a giant German-owned company, investigating the unstable behavior of a company director (Michael Lonsdale). And the two Munich costars generate fine, underplayed tension. Klotz shoots in a palette of grays, then adds Schubert and techno for effective musical disorientation. A-


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