The Weight of Silence by Heather Gudenkauf
This is one of the books I read on vacation, and I couldn't put it down (except for like, going to look at waterfalls and stuff). Calli Clark hasn't spoken a word in three years, despite her gentle mother's and her violent father's attempts to make her talk. Petra, Calli's best friend, sees Calli's father dragging her into the woods one morning near their home, and decides to follow...
Within hours, all three are lost, and a manhunt is underway to find them. This is a taut, dark, intense book filled with slow building tension, and you are just BEGGING for Calli to speak, for the father to leave, for Petra to intervene. I didn't expect the ending of this book at all, but I really enjoyed the story and the narration told from several characters' point of view.
This was an exceptional read, and I'll be recommending it in the future!