Reviewing Argylle without spoiling it is a needlessly tricky dance. Matthew Vaughn's latest spy movie promoted itself through a marketing campaign based on a plot twist, but the tagline only asks one of a hundred questions. It's not so much built around a twist as it is constructed entirely of misdirections. Those shifting motivations, altering identities, and constant triple-crosses rest on a foundation of wasted potential. The cast, the set pieces, and even the semi-fascinating premise fall short of their possible greatness.