Sometimes a little pinch of the unexpected can make all the difference.

But its also something far richer and weirder, and ultimately more interesting.

Tully quickly becomes more than just an after-hours nanny.

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Credit: Kimberly French/Focus Features

She becomes a confidant as she and Marlo stay up late talking and drinking sangria.

Shes like a younger, less jaded version of the person Marlo once was.

Being honest about that especially in a product of the Hollywood dream factory feels almost taboo.

But it shouldnt be.

Maybe thats why Therons performance feels as jumpy and dangerous as a downed power line.

Shes also become bolder and more experimental.

And its a better, less predictable movie for it.

Not by a longshot.

But it doesnt matter.

BecauseTullyis better than that movie.B+