"Moonfleet" by J. Meade Falkner

Well, that was... interesting.  The cover makes it look like it might involve tall ships more than it does.  Or pirates, maybe.  There's stuff with ships, but not loads, and there are no pirates, just smugglers.  Sigh.  Also, I watched the 1955 movie version starring Stewart Granger last year, which turns out to be very, very, very loosely based on this.  More like vaguely inspired by the book, really.
The book is about a British orphan in his mid-teens who has a crush on a local girl, accidental...