as we learned in the end of last episode murderer was daughter Amma (jealous of attention her mother gave to two girls) with help of two skating friends plus she murdered also new black friend in city

mother adora was jailed for murder of her own daughter and attempted poisoning of other two daughters (?), though this is not clear from TV show

i still don't understand who and why throw the bicycle in pond on pig farm, they were explained it i think