Rachel Boynton took three years to make her first film Our Brand Is Crisis, an insider’s look at political machinations in Bolivia. Now she’s spent six patient years with her second, set on the western coast of Africa, where the vast underwater Jubilee oil field has attracted the likes of Kosmos Energy, an American startup headed by big Texan Jim Musselman. Boynton shows us high-level board meetings and behind-the-scenes strategizing with Ghanian entrepreneur George Owusu, then follows low-level pirates siphoning oil from the pipeline. Its biggest coup is an encounter with the Deadly Underdogs, fierce saboteurs who wear ski masks but who want to become famous. With its remarkable access and ambiguous point of view, Big Men is investigative nonfiction filmmaking of the highest order, a gripping, well-crafted work whose sprawling ambitions take us up and down every rung of Ghanaian society. (PS)