OK, here comes the tricky part: Making a spoiler-free case for a film most people haven’t yet seen. As the second installment of the third trilogy, it’s impressively effective as it provides intriguing additional depth and detail for characters and relationships introduced in “The Force Awakens.” Indeed, the evolving dynamic between Forceful antagonists Rey (Daisy Ridley, well on her way to becoming a total badass) and Kylo Ren (Adam Driver) is so fascinating, it’s almost (but not quite) annoying whenever writer-director Rian Johnson cuts away to more action-packed parallel storylines. Mark Hamill gives the performance of his career as a bitterly disillusioned Luke Skywalker, who gets the movie’s best line and, more important, fits perfectly into a “Rashomon”-style subplot. New characters (most notably, Kelly Marie Tran’s resourceful and resilient Rose Tico) are shrewdly introduced to both fill narrative needs here, and suggest additional complications for the next exciting episode. (It appears that, much like the original trilogy, this new triptych will at least hint at a romantic triangle.) And there’s an emotionally wrenching near-death scene in which… No, sorry, can’t go there. Not yet, anyway.