Mrs. Pollifax - Spy(1971)

After Emily Pollifax is widowed and her children are grown, she feels that she is expendable, so she volunteers to be a spy for the CIA. The agency assigns the unassuming New Jersey woman the job of acting as a courier and picking up a book in Mexico City. But things do not go as planned, and during her flight, Mrs. Pollifax winds up handcuffed to a handsome stranger who is on his way to an Albanian prison.