In Secret combines a costume drama with film noir, although that’s not immediately apparent. Working from a novel by Emile Zola, writer/director Charlie Stratton takes his time to develop his tightly-knit group of characters. The economy of characters means there are only a handful of possible outcomes, so Stratton instead focuses on tone, which veers from lustful to foreboding. It is not thrilling, exactly, even if Stratton includes several Hitchcockian elements into his work. Instead, In Secret is a slow-burn look at what happens when ordinary people abandon their morality.