The film stars Édouard Baer, Jean-Pierre Marielle, Audrey Tautou, Jackie Berroyer, Gaspard Gagnol and Noa Bernaoui-Savreux.

11-year-old Leo, dealing with cancer, reads a bedtime story to his younger sister Lily, before sharing a special secret with her: the illness has given Leo the ability to separate his spirit from his physical body, allowing him to hover and fly through the air in an intangible, invisible, and impalpable form, with his body remaining mostly asleep.

Meanwhile, NYPD Lieutenant Alex Tanner is demoted by his boss, Captain Simon, and assigned grunt work after he manages to catch two burglars robbing a supermarket, but blows up part of the building in the process.

That night, a strange man with a greatly disfigured face makes a phone call to the Mayor.

Then the two blackmail The Mole, an ex-con on parole, to help Mary look for information pertaining to The Face's whereabouts as Leo's phantom follows.

Tanner and Leo's fading phantom help her escape the sinking ship but The Face returns, enraged over his plan destroyed.

Back at home, Leo finishes reading Lily a bedtime story and gazes out at the New York City skyline.

The website's critics consensus reads, "Stunning animation and old-fashioned charm more than make up for a relative lack of narrative depth.

"[4] Metacritic, which uses a weighted average, assigned the film a score of 66 out of 100 based on 18 critics, indicating "generally favorable reviews".