1974's The Conversation (another Gene Hackman conspiracy thriller) and 1981's Blow Out both center around protagonists who hear something they shouldn't. Some of the equipment and techniques used in The Conversation were reportedly also used by the Nixon administration. And the murder in Blow Out seems loosely based on Chappaquiddick...

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My award-winning biography of Dag is available on Amazon: https://www.amazon.com/Decoding-Unicorn-New-Look-Hammarskj%C3%B6ld-ebook/dp/B0DSCS5PZT

My forthcoming project, Simply Dag, will be available in hardback, paperback, ebook, and audiobook formats on July 29th!