Un jour, Jakob a changé : il se dit désormais Salafiste. Il s’est trouvé une nouvelle croyance qui prévaut maintenant sur tout le reste. Avec sa caméra, son frère Elí tente de comprendre d’où vient ce changement de coeur et d’esprit et ce qu’il signifie. Il accompagne Jakob a sa mosquée, apprend à connaître ses nouveaux frères et rencontre sa femme. Brother Jakob dresse le portrait intime de deux frères à la recherche d’une vérité.

One day, Jakob changed and began calling himself a Salafi. A new faith that now stands above everything else. With his camera, his brother Elí tries to understand where this change of heart and mind comes from and what it means. He accompanies Jakob to his mosque, gets to know his new brothers and meet his wife. Brother Jakob is an intimate portrait of two brothers and their journey to find a truth.