Marshall deserves credit for knowing how to shoot and cut (alongside editor Wyatt Smith, “Thor: The Dark World”) a musical number, and his work here ranks much closer to his success with “Chicago” than to his dismal “Nine.”

This twisty fairy-tale mash-up shows an appreciation for the virtues of old-fashioned storytelling, along with a welcome dash of subversive wit. It benefits from respect for the source material, enticing production values and a populous gallery of sharp character portraits from a delightful cast.

The film is a whirl of pure pleasure that just keeps whirling: Sondheim doesn’t write show-stoppers but show-surgers, and from the moment the glorious opening number whips up, introducing the central players, the film cartwheels onwards until it lands at its unexpected but quite beautiful happy-ever-after.

Another example of concept over coherence, but the entertainment value is considerable.

Marshall hasn’t made one of the great movie musicals here, but he hasn’t bungled it either — far from it.