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.
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.
As SP and Simon finally have a lead on the whereabouts of June's phone, Philip is told that the hostages have been booby-trapped with Yusuf threatening to detonate.
As the ferry docks in Provestenen, Beate greets Philip, who sees June chasing Rami in the distance. Grabbing a gun, he follows them into a dockside warehouse.
In the garage the police find a wall with newspaper clips of Philip's time as a hostage. Naja is asked to do another interview with a hostage, and this time the police want to make Naja an allie. The hostages try to take matters into their own hands by attacking one of the terrorists during the interview.
With the hostage Bodil just killed by the hostage takers, the police's work keeps growing. TTF's investigation leads them to sources in the Danish military and they seem to be close to a breakthrough.
Philip learns the identity of the main hostage taker and is choked about his personal involvement in the case that leaves a role for Naja to play as well.
Philip goes down into the metro himself hoping to free the last three remaining hostages and is confronted by the man he thought was dead.