Documentary on the deaths of Tupac Shakur and Biggie Smalls and the East Coast/West Coast, hip-hop/rap rivalry that culminated in late 1996 and early 1997.

Nick Broomfield’s guerrilla interviewing techniques-he barges into his subjects’ lives, wielding his boom mike like a nightstick-and his thick British accent have served him well in the past (“Kurt & Courtney,” “Heidi Fleiss: Hollywood Madam”). In his latest documentary, a look at the rivalry between the rappers Biggie Smalls and Tupac Shakur, his work reaches new heights of reckless fact-finding. With a naïveté that’s truly disarming, he captures unrefined gangsta swagger, and his film digs into the unsolved murders of both musicians with a cheeky attitude that’s smooth like butter.