Dark River — Mary Jane Beaufrand

When Ronnie moves from the city to a small town in rural Oregon, she feels secluded from everything and everyone -- except for Karen, a young girl whom she babysits. So when she discovers Karen's lifeless body in the river, Ronnie is compelled to uncover the truth and solve her murder. As she becomes increasingly obsessed with solving the mystery of Karen's death, Ronnie is led deeper and deeper into the woods surrounding the river and to the dark secret hidden within its midst.