Steve Voake 
Fightback [EPUB ebook] 

Kier glanced around and decided things didn't look good. He'd put two armed bank robbers on the floor in less than a minute and he hadn't even broken sweat. If word got back to Jackson about this, he'd be furious… His father is dead, the police want to arrest him and the bad guys want to kill him. But fourteen-year old Kier West isn't about to let that stop him. After watching a young girl fight off three attackers on a train, he learns her secret in a Cretan monastery and quickly discovers that the only way to get justice is to go after it himself…