‘Prima Facie’ Review: Cynthia Erivo Brings Conviction, but Not Necessarily a Conviction, to an Impassioned but Clunky Legal Drama

When a successful stage play is transferred to the screen, the typical concern is how much to “open it out” for the new medium: too little, and you wonder why they bothered; too much, and you lose the electric intimacy that galvanized audiences in the first place. It’s to the credit of “Prima Facie,” director