Twelve old high school friends are murdered one by one during a reunion party that takes place on Christmas eve.

Far from civilization, in a frozen forest on an inhospitable mountainside, a group of researchers is attacked by an unidentified figure. The sole survivor, a young biologist, takes refuge in the isolated cabin of a mysterious man.

An armed robbery is the starting point of an unpredictable story that unfolds in four different versions; one for each of the film’s characters who rival over the "Blue Queen", one of the world’s most rare diamonds.