Barnavännen (2004)

"The Childhood Friend." - Tomas lives with her parents. One day, his father's cousin Serkuu comes to visit. At first Serkuu wins Tomas's trust but later he brutally let's him down. Fifteen years later, Tomas has become a police officer and takes his service revolver when calls on Serkuu to retaliate.

Unfortunately the movie Barnavännen is not yet available on HBO Max.