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World-renowned humanitarian Juliet Sinclair (Ruth Roman) has arrived in America to deliver a cute Chinese orphan girl named Linh (Cherylene Lee) to loving couple named Kenyon (Gene Hackman, Phyllis Love). What the general public doesn't know is that Juliet is also a Communist courier, and that her American contacts are none other than Mr. and Mrs. Kenyon. Unfortunately, Linh has learned the truth about her benefactor--and unless Inspector Erskine (Efrem Zimbalist Jr.) can act quickly, the Kenyons will follow orders and silence the girl permanently.