Great drama, acting, etc….. but

I really enjoyed it and liked the ending for the 3 mains. But there’s a massive plot hole!! The girl and her partner and her brother……they found the phone and that the end of their story?? If they hadn’t found the phone I’d be happier, the brother would have developed into a different and better police man because of his sister, I could accept that but finding the phone should have lead to something! 10/10 otherwise.