[1] The story is based on the real-life case of the Bethnal Green trio, in which three teenage girls from London met jihad recruiters at their school in February 2015.
The story starts with Pervin, a young Muslim woman from Sweden who lives under ISIS rule in Raqqa, Syria, with her Islamic State member husband Husam and their newborn daughter Latifa.
After acquiring a cell phone from her neighbor and friend Tine (who is dragged away from Pervin's home, where she was hiding trying to escape being forced to remarry after her husband's death), she contacts Dolores, an anti-radicalization advocate in Sweden.
Al Musafir is Ibrahim "Ibbe" Haddad, who is working as a teacher's assistant in a high school, while recruiting others into the terror attack.
He has already successfully recruited two brothers – Jakob, a former prisoner and alcoholic, and Emil, the younger, sensitive, and mentally disabled sibling.
Under a different identity, Ibbe also recruits Miryam, who was raised in Baghdad, and promises her marriage in exchange for her work in his plans.
Ibbe simultaneously tries to radicalize young girls at the high school by sharing ISIS recruitment videos and propaganda.
He successfully recruits Sulle, a Palestine activist, and her friend Kerima, both 15-year-old girls who start wearing the hijab and taking lessons in following Sharia law.
The girls are shown pictures of palaces and told that if they moved to the Islamic Caliphate, they could live in luxury and be part of something special by marrying jihadist fighters.
Sulle inadvertently pulls her 13-year-old sister Lisha into the Islamic extremist ideology, the implications of which are not fully realized until later in the show.
Husam is under the influence of sleeping medicines and happens to walk into the kitchen and see the blood on the floor, but Pervin convinces him that he is dreaming.
Meanwhile, Sulle and Kerima have plane tickets to travel to Turkey, and are picked up by Ibbe and the woman who has been teaching them about Islam.
Her father Suleiman, who voices his disdain of religion, finishes work early and decides to go and watch her game, but sees that the stadium is empty.
Husam tries to buy time, but Lisha who is completely radicalized (even moreso than her sister was) and unwilling to return to Sweden, reveals their escape plan to Omar.
Kerima tries to commit suicide, and is taken to a mental health facility where she gets her hands on a cell phone and warns Ibbe that his cover may be blown.
In the concert facility toilets, Kerima briefly attempts to remove the vest, but fails; so instead warns some of the attendees in there, who flee, and waits for the bomb to explode while having a final exchange with a tearful Sulle over the phone.
The series was produced by Filmlance (The Bridge) for Swedish broadcaster SVT, and sold by Endemol Shine International.