Toni Collette, Tracy Letts and True Blood's Sam Trammel have joined Daniel Radcliffe in the thriller ?Imperium,? which has started shooting in Virginia. Daniel Ragussis is directing ?Imperium,? which follows Radcliffe?s character, a special agent with the Federal Bureau of Investigation who specializes in domestic terrorism and covert operations. Collette portrays a veteran battle-hardened colleague, Letts is playing a leader of the white supremacy movement and Trammell is a seemingly normal suburban dad who is also the local Aryan youth recruiter. The script was co-written by Ragussis and former FBI agent Mike German whose counterterrorism activities inspired the movie?s plot.