What is the problem and solution of silent to the bone?

In "Silent to the Bone" by E.L. Konigsburg, the central problem revolves around the mysterious incident where thirteen-year-old Branwell falls silent after being accused of harming his baby half-sister, who is left in a coma. The narrative unfolds as Branwell's friend, Connor, seeks to uncover the truth behind the incident and understand why Branwell stopped speaking. The solution involves Connor's investigative efforts, which lead to revelations about family dynamics, trauma, and the importance of communication, ultimately helping Branwell find his voice again. Through this journey, themes of loyalty, friendship, and the complexities of growing up are explored.