"The Weight of Silence" by Heather Gudenkauf

This follows the story of Antonia, her husband Griff, and their children Ben and Callie. Callie hasn't spoken a word in over 4 years, and her best friend Petra is her voice. One early morning Callie and Petra go missing, and Griff (Callie's father) is a suspect in their abduction. Martin, Petra's father goes to the extreme when it comes to getting his daughter back. I liked this one!