“Red Joan” knows exactly how to play to its target audience. This is not a procedural spy thriller or a dissection of World War II political gamesmanship. There’s nothing particularly edgy about the production. Instead, screenwriter Lindsay Shapero takes a more soap opera-ish approach to the subject, turning this tale of secrets and lies into acts of heartbreaking exposure to all-consuming love. For some, such mushiness is going to be a turn-off, with director Trevor Nunn (who hasn’t helmed a big screen feature since 1986’s “Lady Jane”) creating a softer push of melodramatics to buffer a tale of treasonous behavior and patriotic confusion. For others, “Red Joan” will be cat nip, especially for older art-house crowds who enjoy their global conflict reduced to areas of romantic indecision, blended with some mild espionage action. Read the rest at Blu-ray.com