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- Follow Us! The Secret World of Arrietty hits theaters on February 17th, 2012. Cast: Will Arnett, Amy Poehler, David Henrie, Carol Burnett, Saoirse Ronan 14-year-old Arrietty and the rest of the Clock family live in peaceful anonymity as they make their own home from items "borrowed" from the house's human inhabitants. However, life changes for the Clocks when a human boy discovers Arrietty. The Secret World of Arrietty trailer courtesy Walt Disney Pictures.