Good atmosphere, but a very poor plot

Rating: 5/10 (8 December 2019)

This movie was recommended to me by my sister and also had an 8+ rating here on IMDB. Maybe because of that I expected too much, but the fact is that I just didn't like Prisoners. The acting performance and the creation of atmosphere and suspense were okay overall, what you can expect from this genre. But I found the storyline to be absolutely very weak.
Every breakthrough in the investigation is based on pure luck, and apart from that there are several elements in the story that just don't make sense. How does the copy-cat know where the children live to steal their clothes? Why does he commit suicide while he was innocent? Why does Alex, a victim himself, not say more when being tortured for several days? Why does the aunt suddenly loses her cool by not opening the door and stoppng to hide the girl? Why can't the police find any forensic evidence in the RV if the girls had been in it?
It's just a bad scenario with too many holes or unlikely events in it.