JJ Magill returns to Ireland to find the family factory is facing bankruptcy. During a rescue with fellow crew members Jakub and brother Macdara, unknown to JJ, they discover a murdered woman on a boat (An Bronntanas). They try to rescue the woman, Anna, until Macdara and Jakub discover something else on the boat. Something that will change their lives forever.
The arrival of Inspector Fiachra Greene, son of local police Sergeant Sean Óg, to investigate the woman’s murder shocks JJ and his other rescue members. JJ was not expecting to see his old friend nor was he expecting him to head the murder squad, worse JJ realizes that he cannot trust his brother or Jakub.
Inspector Fiachra Greene is a different kind of cop. At the morgue he begins to get surreal images of the murder. Does Fiachra Greene know more than he admits? Elsewhere, two thugs visit the village in order to get their cargo, for information they attack JJ’s Mother and kidnap Macdara.
Fiachra realizes he will get exposed by the forensic team and loses patience. Sean Óg is becoming more and more suspicious of events in his small village. When the An Bronntanas burns Sean Óg must decide should he uphold the law or not?
Jakub is returning to Poland and Macdara is in intensive care. JJ barters with Fiachra; is it the only way to get him to stop his rampage? Sean Óg surmises that his son is guilty of serious crime. Events lead to a bloody climax, were only one person will come out of the cave alive.