Tom Cruise and Cameron Diaz are in great shape in James Mangold’s new action comedy “Knight and Day,” a silly, yet wildly entertaining summer blockbuster stuffed with witty dialogue, refreshingly brainless action and interesting enough characters you’ll instantly like. A secret agent in trouble runs into a charming woman, and together, they try to put an end to the chaos that surrounds them is the plot of the story. Part of the fun stems from Cruise’s character--superspy Roy Miller--remaining absolutely unflappable in the face of every conceivable danger.Then there’s Diaz, playing audience surrogate and gal-next-door June Havens. She bumps into Miller at the airport on the way to her sister’s wedding; he slips a super-secret MacGuffin into her bag to get it past security, then joins her on a nearly empty flight to Boston. The sparks fly as they chat over mini tequila bottles. Then June heads to the bathroom and the remaining passengers reveal themselves as assassins bent on icing the two of them. Roy wades into them (and thank God we’ve grown and healed enough as a nation to let good guys kill bad guys at 30,000 feet again), but the plane goes out of control, and… well then we’re off to the races. Fortunately, Roy can fly a plane, and they land with a bare minimum of destruction to plane, but much destruction to a Mideast cornfield.Roy warns her that there will be men with dark glasses wanting to speak with her. Wanting to speak with her about him, specifically. He asks her not to mention anything about him. Then he drugs her. No, because June wakes up in her own house, with minimal groggy buzz. She attends April’s (Maggie Grace, drugged and bid on by Albanian slave traders in last year’s Taken) fitting. A guy walks into the dress shop says that her truck will be given a ticket. When exits she’s surrounded by men in dark glasses and told to enter a vehicle.June meets an agent named Fitz (Peter Saarsgard) who tells her she’s “safe” and that they know she was with Roy Miller the previous night. June cannot afford to let her sarsguard down .It seems that Roy Miller was a highly decorated secret agent that went rogue, stealing something called the Zephyr and is willing to sell it to the highest bidders, even if the highest bidders are bad guys. Since Miller was one of the best agents like, ever, it may be a mission that’s doesn’t have a great chance of success, maybe even impossible, but Miller must be stopped. Could the item Roy slipped and the recovered from June’s possession be the Zephyr? (MASSIVE SPOILER) Yes.While June is trying her best to take in all this exposition, something has grabbed her attention. It looks a lot like Roy riding a motorcycle with a gun in his hand, much like in the climax of M:I II. Maybe she should have just gotten on that other flight.What is the Zephyr, and why is it so important? It’ll be explained to you, but it’s really not that crucial as it’s just the MacGuffin between action sequences. Hint: June might want to have one in her vibrator, though not for very long..