When Rowan's parents divorce, her brother Luke turns 'cold and strange', and suddenly Rowan starts hearing voices. Is someone stalking her or is she going mad? London is caught in the grip of the coldest winter on record. The Thames freezes over and the streets are half-buried by snow.
Rowan soon realises that Luke has been snared by the enemy; the voracious Hunters who want 'power over all', and finds that she is running for her life across the increasingly bizarre landscape of the frozen city. It takes a journey into the treacherous depths of Midwinter to save not only Luke, but all that she holds dear.
"The old lady looked long into Rowan's eyes. In the green depths Rowan thought she could see faces amongst leaves, human-like, creature-like, deer running in the shadows of a great forest. "They are in for the kill, Rowan. Remember you have allies. But take care, for 'The Hunters' have many spies."