Joachim Trier's new film Sentimental Value, starring Elle Fanning, drew rave reactions at the Cannes Film Festival.

It took nearly until the end of the festival, but the Cannes Film Festival has its first outright sensation.Joachim Trier’s “Sentimental Value” premiered Wednesday night to the kind of rapturous response that Cannes is fabled for.

Of late, Fanning’s been doing her best work. Her portrait of Bob Dylan’s girlfriend Suze Rotolo, although she was named Sylvia Russo in A Complete Unknown, was underrated by critics, and I found rare honesty in the tremulous magnanimity she brings to her role as a Hollywood actress.