Woody Allen’s welcome return (1993) to straight-ahead entertainment, after 15 years of slogging through art-house hand-me-downs, happily coincided with a return to Diane Keaton as his leading lady, and she deftly steals the show. (Cowriter Marshall Brickmanwho hadn’t worked with Allen since Manhattanprobably makes a difference as well.) Allen and Keaton play Allen’s standard bored, upscale Manhattan couple; they get a jolt of adrenaline when they hear that the older woman next door has implausibly died of a coronary. As Keaton begins snooping compulsively around the woman’s husband (Jerry Adler), two friends (Alan Alda and Anjelica Huston) get drawn into the amateur sleuthing, and finally so does Allen. PG, 104 min. (JR)