The recently returned Syrian warrior, June al-Baqee, is taken hostage by four Islamist terrorists, several of whom are believed to be returning Syrian warriors who – unlike June – fought ISIS in Syria. Philip Nørgaard, currently is on leave from TTF, June knows from the past and, unlike PET, believes that a major crime lies behind her disappearance. He decides to investigate the case on his own.

Philips’ hunt for June has led them both aboard the Swedish ferry in the Sound. As June opportunistically manages to escape the hostages and hide, they now have to panic search the ferry before it reaches land. Meanwhile, Philip manages to alert the Ferry Captain, who activates the terrorist alarm. Soon PET and the Defense Intelligence Service are realizing that a highly tense and apparently Islamist terrorist campaign is underway. The police anti-terror unit TTF is activated, but this time without Philip to lead it.

The hostages have hijacked the ferry and taken passengers and crew hostage. While the ship is stationary in the middle of the Sound, the TTF from their position at Kronborg tries to get an overview of the situation. Negotiation and attack strategies are evaluated and the attackers motive investigated. On the ferry, the hostages still find June unsuccessful, and they must now use other means to lure her out of her hiding place. But Philip is also looking for June.

With Philip trapped in the ferry’s freezer room, the hostages use harsh methods to grab June’s cell phone, which turns out to be the object of their kidnapping and hijacking. On land, investigators SP and Simon quickly try to get closer to the hostages’ identities, motives and possible conspiracies, while the TTF with the government in the back sets for an armed surprise attack to get all the hostages released and the situation shut down once and for all.