The advance hype for the adventure comedy "Knight and Day" has centered on the creative input of its star, Tom Cruise, still hungry for redemption after his mid-decade meltdown. What speaks well of him here is that his costar, Cameron Diaz, has retained her loyalty to him. (The two teamed up on "Vanilla Sky"; she did a walk-on for "Minority Report.") Diaz has been a game, resourceful star even when she's chosen projects badly. In that tearjerker "My Sister's Keeper," she was an unexpected powerhouse, conveying the heroism and the tunnel vision of a zealous mother. The best scenes in "The Holiday" (above) featured Diaz matching an infinite variety of stutter steps to an array of smart, dizzy glances as a single woman who's a bundle of resentment, intelligence and feeling. In "Knight and Day" she has a director, James Mangold, who has brought out new facets of male and female performers in films like "Walk the Line" and the remake of "3:10 to Yuma." Let's hope, under Mangold's direction, she and Cruise make beautiful action together. How much are you looking forward to it?