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When the caretakers at a remote retirement home in France begin disappearing without a trace, a newly hired nurse discovers that Deadlock House harbors a dark secret. Aside from their unique vegetarian diet, the elderly inhabitants of Deadlock House seem like your typical, bored retirees. But why is one particular resident growing increasingly aggressive, and what's with that that spooky song the house director keeps obsessively pounding out on the rickety old piano? The more newly arrived nurse Martine (Isabelle Goguey) learns about this bizarre retirement home, the more she realizes that she should have thought twice before accepting the job.