Movie Story : Arndt Wolf, a German bio-weapons expert, previously searched Iraq as part of a UN mission and found no weapons of mass destruction, yet he remains convinced that Saddam Hussein is concealing something. Colleagues have lost interest in the subject, but that changes when an Iraqi asylum seeker says he helped manufacture chemical weapons. The German Federal Intelligence Service calls Wolf in to determine whether the informant, codenamed "Curveball," is telling the truth.