I'm gonna give you a summary of the whole thing so you can save yourself 4 hours of face palming and boredom.
It's pretty much a story about a girl who went missing and a weird letter was left behind, and her brother decided the father killed her and mother protects him, so he cut all contact with them for over a decade, prevented them from seeing the grandchildren too, even though there is literally zero proof that they actually did anything and it's all just based on a hunch. The series keeps repeating the same things over and over trying to convince you really hard that it's the parents even though there are no new details to support that so they just keep replaying the fake narrative again and again just to drag this to fill the first 3 episodes.
The police is doing an awful job too, losing the file and making it seem like the father stole it (a decade later they are like "oh nvm we found it"), supporting the brother's theory and encouraging him to hate his parents even though there is no proof, and what they did with the letter is just beyond stupid. You really don't need to be an expert in order to look at the letter and say right away that it was written with someone's non domminant hand, possibly the girl herself. You also don't need to be an expert in order to look at the handwriting of both parents and tell that there is no way they are the ones who wrote this letter. But what the police does is checking with an expert if the father wrote it, finding out he didn't, and then just assuming "well then if it's not him, it must have been the mother who wrote it to help him cover for his murder". They assume that, yet it takes them over a decade (!!!) of assuming that (a decade of brother not talking to his parents too) before they bother checking with an expert if the mother's handwriting matches. And of course it doesn't, so none of the parents could have written that letter. IF ONLY they checked it back then and saved this family a decade of not talking to each other...
The other thing is they assume she is dead because she lived in a neighborhood with a gate, it would have been too far for her to walk from her house to the gate by foot so in order to get out she would need someone to drive her, but someone who comes from the outside couldn't get through the gate in order to pick her up, they can't think of any other way she could get out so the only logical thing they can think of is that she couldn't have gotten out at all and must have been murdered. At no point anyone brings up the obvious possibility of someone from inside her neighborhood, just a friend of hers, who has full access to the gate, simply giving her a lift to get out and then coming back without her. It just doesn't even cross their minds???
Then on the last episode when they finally drop out the fake scenario of "it was the parents", they decide it was the ex boyfriend, even though again, there isn't any actual proof. An expert checks his handwriting but it's impossible to say if it is or isn't him, so everyone comes to the conclusion of "that means it must be him then!!!". The whole time they also talk about the possibility of maybe that girl just wrote the letter herself before she ran away from home out of her own choice, but at no point anyone bothers doing the very obvious thing you should do which is check HER OWN handwriting with an expert to see if it's possible that she wrote it, because why would they do the most logical thing when they can just go based on hunches?
Then at the end it's pretty much "well there is no proof it was the ex boyfriend either so yeah, case is still open and we don't know what actually happend and we have no other leads, bye", not worded like that of course but that's the conclusion of this so called documentary series.
It's pretty much a story about a girl who went missing and a weird letter was left behind, and her brother decided the father killed her and mother protects him, so he cut all contact with them for over a decade, prevented them from seeing the grandchildren too, even though there is literally zero proof that they actually did anything and it's all just based on a hunch. The series keeps repeating the same things over and over trying to convince you really hard that it's the parents even though there are no new details to support that so they just keep replaying the fake narrative again and again just to drag this to fill the first 3 episodes.
The police is doing an awful job too, losing the file and making it seem like the father stole it (a decade later they are like "oh nvm we found it"), supporting the brother's theory and encouraging him to hate his parents even though there is no proof, and what they did with the letter is just beyond stupid. You really don't need to be an expert in order to look at the letter and say right away that it was written with someone's non domminant hand, possibly the girl herself. You also don't need to be an expert in order to look at the handwriting of both parents and tell that there is no way they are the ones who wrote this letter. But what the police does is checking with an expert if the father wrote it, finding out he didn't, and then just assuming "well then if it's not him, it must have been the mother who wrote it to help him cover for his murder". They assume that, yet it takes them over a decade (!!!) of assuming that (a decade of brother not talking to his parents too) before they bother checking with an expert if the mother's handwriting matches. And of course it doesn't, so none of the parents could have written that letter. IF ONLY they checked it back then and saved this family a decade of not talking to each other...
The other thing is they assume she is dead because she lived in a neighborhood with a gate, it would have been too far for her to walk from her house to the gate by foot so in order to get out she would need someone to drive her, but someone who comes from the outside couldn't get through the gate in order to pick her up, they can't think of any other way she could get out so the only logical thing they can think of is that she couldn't have gotten out at all and must have been murdered. At no point anyone brings up the obvious possibility of someone from inside her neighborhood, just a friend of hers, who has full access to the gate, simply giving her a lift to get out and then coming back without her. It just doesn't even cross their minds???
Then on the last episode when they finally drop out the fake scenario of "it was the parents", they decide it was the ex boyfriend, even though again, there isn't any actual proof. An expert checks his handwriting but it's impossible to say if it is or isn't him, so everyone comes to the conclusion of "that means it must be him then!!!". The whole time they also talk about the possibility of maybe that girl just wrote the letter herself before she ran away from home out of her own choice, but at no point anyone bothers doing the very obvious thing you should do which is check HER OWN handwriting with an expert to see if it's possible that she wrote it, because why would they do the most logical thing when they can just go based on hunches?
Then at the end it's pretty much "well there is no proof it was the ex boyfriend either so yeah, case is still open and we don't know what actually happend and we have no other leads, bye", not worded like that of course but that's the conclusion of this so called documentary series.