This film tells the extraordinary story of the rise and fall of Robert Oppenheimer. David Straithairn, whose previous recreation of this era in Good Night and Good Luck was Oscar-nominated, plays Oppenheimer trying to defend himself as he was effectively put on trial for being a communist. Re-creation is mixed with expert testimony from a definitive range of commentators, ranging from Oppenheimer's Manhattan Project colleagues to academics like Martin Sherwin and Priscilla MacMillan.