Seven oil companies, nicknamed the Seven Sisters, meet in secret at Achnacarry Castle in Scotland on August 28, 1928, and agree to divide the world's oil markets among themselves rather than compete. This four-episode series traces what that pact built: support for the monarchies in Iran and Saudi Arabia, opposition to the founding of OPEC, and profit taken from the Iran-Iraq war that ends with Saddam Hussein's downfall. By the late 1960s the Sisters control 85 percent of global oil reserves; today that share has fallen to roughly 10 percent, and the series follows where they go looking to rebuild it. Episodes move from the Middle East to Africa, the continent now framed as the industry's new frontier amid peak oil and rising crude prices, then to the Caucasus, where the United States and Russia compete for the pipeline routes running through Tbilisi, Yerevan, and Baku. Azerbaijan's oil emerges as the region's strategic prize. The series argues that a handful of corporate decisions from 1928 still shape wars and alliances nearly a century later.