该片根据真实事件改编，1980年伊朗驻伦敦大使馆遭六名恐怖分子袭击，而SAS(特种空勤团)战士等和恐怖分子的对峙持续将近六天，第六日最后的反击开始。

  In April 1980, armed gunmen stormed the Iranian Embassy in Princes Gate, London and took all inside hostage. Over the next six days a tense standoff took place, all the while a group of highly trained soldiers from the SAS prepared for a raid the world had never seen the likes of.