William Gibson's timely one-woman play examines the threat of Mideastern conflict mushrooming into nuclear holocaust. Valerie Harper plays Golda Meir, Israel's prime minister from 1969 to 1974, recounting her crisis of conscience during the 1973 Yom Kippur War, when she considered using nukes against the Arabs (the title refers to her observation post in a secret weapons facility). She also recalls her birth in czarist Russia, American upbringing, emigration to Palestine, and role in the creation of Israel, ruminating on the strain of balancing idealism and ruthless pragmatism. Harper portrays multiple supporting characters, including Meir's husband and Henry Kissinger; ironically, her display of technical virtuosity makes Meir's life clear but undercuts the story's emotional impact. Through 6/11: Thu 7:30 PM, Fri 8 PM, Sat 2 and 8 PM, Sun 2 PM, LaSalle Bank Theatre, 18 W. Monroe, 312-902-1400, $32-$65.