Flick picks: ‘My Cousin Rachel’ sustains murder mystery through the very end

Did she or didn’t she? That’s the scintillating premise of the swooning gothic romance “My Cousin Rachel” based on Daphne Du Maurier’s 1951 novel starring Rachel Weisz as the titular widow.

The story is set in Victorian England on the country estate of Ambrose Ashley (Sam Claflin), a bachelor who is guardian to his orphan cousin Philip (also, as an adult, Claflin). Health issues drive Ambrose to warmer climes, though he keeps in touch with Philip by mail.

It’s through Ambrose’s letters…