The Breakthrough is one of the best non-English-language thrillers on Netflix, but there's another show that could fill the hole left by the popular series. Based on a screenplay by Oskar Söderlund, Peter Eggers and Mattias Nordkvist lead the cast of The Breakthrough. The series follows the investigation of a double homicide that took place in a small Swedish town. The murders were unsolved for several years until a genealogist revealed a way to crack the case open.