Sara is Missing (2017)

Sara Young is living carefree with her brother and parents until she is kidnapped and nobody can find her. A day later two kids go hiking and find her phone. They then invite her brother over to tell him the news of them finding her phone. Then, he gets mad that they want to keep it so, he gets out a knife and stabs Janet. Janet and her brother ran away and when Mike was sick they snuck into his house to take the phone but what they find isn't a free phone but deadly secrets.