A shocking video shows four men, clinging to wreckage in the sea. Shots ring out. The men are brutally killed - one by one. On the trail of the killers, maritime investigator Karsten von Hoesslin dives into the murky depths of the lawless oceans and encounters drug smuggling, people trafficking, illegal fishing and piracy. The high seas are beyond the reach of the law so if you want to get away with murder, this is the place to do it.