The Client. Penguin Readers Level 4

Eleven-year-old Mark Sway accidentally witnesses a murder and becomes the target of relentless prosecutors and the mob, and the only person who can save him is Reggie Love, an attorney barely out of law school.
Penguin Readers is a graded reading series for English Language Teaching (ELT) markets, designed for teenagers and young adults learning English as a foreign or second language.