For Valour by Andy McNab

When a young trooper is shot dead at the SAS’s renowned Killing House, Nick Stone is uniquely qualified to investigate. Less than forty-eight hours later, he finds himself in the telescopic sights of an assassin bent on protecting a secret that could strike at the heart of the establishment – the establishment that Stone has, in his own maverick fashion, spent most of his life fighting to protect. Isolated and under perpetual threat, he is propelled across Europe in a desperate quest to uncover the truth behind a terrible chain of events that began with a young man haunted by the screams of his brutally murdered friend.