Bradley Cooper ("The Hangover," TV's "Alias") is set to star in the thriller "Dark Fields" for Relativity Media and Rogue Pictures says Heat Vision.

Based on Alan Glynn's book, the story follows a down-and-out writer (Cooper) who gets his hands on a top-secret pharmaceutical drug that makes one smarter. He experiences sudden financial and social success but soon discovers that the drug has lethal and lasting side effects.

Before long, mysterious antagonists are pursuing him. Cooper replaces Shia LaBeouf who was originally attached to star

Neil Burger directs from a screenplay by Leslie Dixon ("The Thomas Crown Affair").