Josh Hartnett describes how he prepared to play a serial killer in new thriller movie

Actor Josh Hartnett is taking on a new and challenging role in M. Night Shyamalan's thriller, "Trap."

Hartnett plays Cooper, a seemingly loving father who takes his daughter to a pop concert. He quickly realizes the concert is an elaborate setup for police to catch a serial killer known as "The Butcher."

The twist is that Cooper is "The Butcher" — or he at least appears to be.

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