Two brothers have been at loggerheads since the tragedy that divided their family 15 years ago: a terrible accident that caused the death of their father and about fifteen miners in a mine that has since closed. One is a cop, the other a gendarme, will be brought together to solve a new case of murder of one of their friends, the son of a miner. The ongoing investigation will revisit the history of a region and unearth the secrets related to the drama of the past.