An old favorite originally made in the 1960's, Coronet Blue
Watching it when it aired, I recognized an exterior sequence using my prep school, Horace Mann. They shot a lot of TV on that campus.
The creator eventually released a denouement in text. I don't think it can be called a spoiler now, when it's not going to be produced for TV, any more than my exposure of the solution of
Lost is. Turns out he was a Soviet agent. What would've been really cool is if he'd been
faking amnesia, but that's not what they'd written.