The Go-Between (1971)

British teenager Leo Colston spends a summer in the countryside, where he develops a crush on the beautiful young aristocrat Marian. Eager to impress her, Leo becomes the “go-between” for Marian, delivering secret romantic letters to Ted Burgess, a handsome neighboring farmer.
Joseph Losey
Julie Christie, Alan Bates, Edward Fox, Michael Redgrave, Dominic Guard, Margaret Leighton, Michael Gough, Richard Gibson, Simon Hume-Kendall, Roger Lloyd Pack, Amaryllis Garnett, Keith Buckley, John Rees, Gordon Richardson, Jim Broadbent, Joshua Losey, Arnold Schulkes, Anneke Wills
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