silent to the bone by E. L. Konigsburg

When Branwell's half-sister Nikki is rushed to the ER with head injuries, he stops speaking. It is up to his friend Connor, with the help of his half-sister Margaret Rose*, to find out what happened and clear Branwell's name. An engrossing mystery that you don't want to put down.

Highly Recommended

*from The Outcasts of 19 Schuyler Place