According to EW, Radcliffe's character in the movie, Ignatius "Ig" Perrish is a "less-than-angelic young man" who wakes up to realize he's got horns on his forehead.
Radcliffe told the site that this character is unlike anything he's done:
"It's a very very different type of part that anything I've done before."
He also described his role as "deeply emotional and also incredibly outrageous in some ways."
Horns is based on the book by Joe Hill, about young man who is accused of raping and murdering his girlfriend. The horns he curiously gets give him the power to make people confess their sins and tell the truth, something that helps him uncover the truth about the crime.
Here's a brief synopsis of the book:
Ignatius Perrish spent the night drunk and doing terrible things. He woke up the next morning with a thunderous hangover, a raging headache . . . and a pair of horns growing from his temples.
At first Ig thought the horns were a hallucination, the product of a mind damaged by rage and grief. He had spent the last year in a lonely, private purgatory, following the death of his beloved, Merrin Williams, who was raped and murdered under inexplicable circumstances. A mental breakdown would have been the most natural thing in the world. But there was nothing natural about the horns, which were all too real.
The film also stars Max Minghella, Juno Temple, Joe Anderson and Kelli Garner.
Between the story's description here and Radcliffe's thoughts on his character, Horns sounds very intriguing and different. It's certainly a unique story, and the cast is pretty good too.
Here's the photo: