Looking for the 2015 film 'The Preppie Connection' – MTRJM version – available online. Fasl Alany edition.
So the user is searching for:
A garden-party sequence that flips from sun-drenched revelry to a desperate cover-up; a late-night confession in an empty boathouse that reframes earlier events; and a courtroom-adjacent showdown where social capital and truth collide.