Kate Winslet has come aboard to narrate Fridrik Thor Fridriksson’s Toronto-bound autism documentary The Sunshine Boy.

The film is a first-person account by Frontier Filmworks producer Margret Dagmar Ericsdottir of her quest to understand her severely autistic, 11-year-old son Keli.

“I am delighted and honoured that Kate agreed to do the narration,” Ericsdottir said. “Her contribution plays an instrumental role in increasing awareness for autism, which many claim is the world’s fastest-growing epidemic.”

Fridriksson’s film explores the entire spectrum of autism, focusing on Ericsdottir’s mission as she meets with the world’s leading experts on the disease. The quest takes her to Austin, Texas, where she and her husband are astounded to see Keli’s mind unlocked by therapist Soma Mukhophadhyay.

Icelandic singer Bjork and the Icelandic band Sigur Ros contribute to the film.

The Sunshine Boy will receive its world premiere in the Real To Reel section in Toronto on September 12.