Or rather “The Unknown,” Cale’s new solo show, a psychological thriller starring Hayes as a gay writer who, in an early and pivotal scene, meets a handsome but mysterious stranger over red wine at Julius’. Their flirty encounter triggers a slow-burn descent into madness, although who the characters are and who exactly is going nuts are the play’s unnerving fuel. (The Off Broadway show is in previews at Studio Seaview; opening night is Feb. 12.)