In Focus, Will Smith's suave con artist Nicky Spurgeon tells his protégé/part-time lover Jess Barrett (Margot Robbie) his version of the done-to-death cliché: there are two types of people, hammers and nails.
It's one of those movies where everything turns out to be a con so you never have to think about which thing is a con, meaning you can sit back and enjoy an OK-enough comedy about a May-December relationship built on a foundation of gambling and thievery.
This is the kind of movie where we're not supposed to know at any time who is playing whom, but since the characterizations are glossy and paper-thin, it's difficult to get worked up about who gets fleeced.