A Chechen Muslim illegally immigrates to Hamburg and becomes a person of interest for a covert government team tracking the movements of potential terrorists.
Professional diver Sven has a guilty conscience: his job means he has too little time for his family. He even almost misses the cruise ship on which he is supposed to look after their daughter while his wife does research for an article about the ship. But then terrorists take over the MS SeaStar and take Sven's wife and daughter hostage. They threaten to blow up the entire ship.
