故事從天主教中有7種死罪說起，一場離奇的連環殺人案，受害者都是死於這7宗罪其中一種。經驗十足的警探Somerset努力不懈，终於將這些看似沒有聯繫的命案屢出頭緒。5宗命案過後，兇手下一個目標是誰？警方不知所措，兇手卻奇跡般自首，此時他的「七宗罪」還差兩宗⋯⋯

A civilized dinner party in a country house sees four friends, Lucas, Adam, Chloe, and Eve, coming together for a birthday celebration. As the night progresses secrets and lies force themselves into the light and polite pretensions are dropped. A knock at the door reveals three masked intruders with an agenda of their own. Will their friendship stand the test? Can they survive the night or will their secrets eventually catch up with them?