New Patrol (Penguin Random House Children's UK)

Know your enemy. Liam Scott is back in Afghanistan, this time with 4 Rifles. No longer the new guy, it's his chance to prove himself and take the lead. But the warzone has changed dramatically, and so have the rules. Working alongside the Afghan National Army, Liam and his new patrol face daily attacks from Taliban insurgents. But the real threat seems to be coming from within his unit. It looks like there's a traitor in their midst.