Toni Collette, Tracy Letts ("Homeland") and Sam Trammell ("True Blood") have joined the Daniel Ragussis-directed thriller "Imperium" at Lionsgate Premiere. Shooting is underway in Virginia. The story follows an FBI special agent (Daniel Radcliffe) who specializes in domestic terrorism and covert operations. He goes undercover and joins a white supremacist group in order to expose a sizable terrorist plot to create a bomb. Collette portrays a veteran battle-hardened colleague, Letts plays a leader of the white supremacy movement and Trammell a seemingly normal suburban dad who is also the local Aryan youth recruiter. Ragussis and former FBI agent Mike German penned the script while Ty Walker, Dennis Lee and Simon Taufique are producing. Source: Variety