When the Germans discover nuclear fission, a troubled American physicist must race against the clock to detonate an atom bomb, but when his loyalty is questioned, he must fight a rigged tribunal to have his security clearance reinstated.

>>When tasked with ending World War II.

The logline should include an explicit statement of the urgency (with implied stakes). The explicit urgency was a race against time to develop an atom bomb before the Nazis. The implied stakes: whoever won the race would win the war.

Also, the plot is based on real historical events during World War II, specifically the Manhattan Project. So this is an exception to the general rule that a logline should not name the protagonist. In this instance, it is OK, even necessary to name the historical character (J. Robert Oppenheimer) involved in the historical event.

And equally as important, his role: Oppenheimer wasn't just a "visionary physicist"; he was tapped to perform in the central role of the plot as the director of the Manhattan Project.