Gwil, a battle-hardened mercenary, is horrified to stumble across a little girl close to death. She has been attacked, just one more victim in a winter of atrocities. Clutching a sliver of parchment, she is terrified – but Gwil knows what he must do. He will bring her back to life. He will train her to fight. And together, they will hunt down the man who did this to her. But danger looms wherever they turn. As castle after castle falls victim to siege, the icy Fens ring with rumours of a madman, of murder – and of a small piece of parchment with a terrible secret to tell, the cost of which none of them could have imagined...