Benjamin Zephaniah, Bloomsbury, £5.99
When the "blood brothers" Lionel and Ramzi stab a teacher in front of many witnesses, fellow pupil Jackson can't help but wonder why. While everyone dismisses the "blood brothers" as "teen killers", Jackson can't stop his inquisitive mind keeping him awake at night. What had driven them to do such a terrible thing? And why had they walked away so calmly after the act?