Iraq's 'Triangle of Death', 2005. A platoon of young soldiers from a US regiment known as the 'Black Heart Brigade' is deployed to a lawless and hyperviolent area just south of Baghdad. Almost immediately, the attacks begin: every day another roadside bomb, another comrade blown to pieces by insurgents... 1st Platoon, Bravo Company descend into a tailspin of poor discipline, substance abuse, and brutality - with tragic results...