Northern Lights (His Dark Materials book 1) (Kindle Edition) by Philip Pullman 99p @ Amazon

Lyra Belacqua lives half-wild and carefree among the scholars of Jordan College, with her daemon, Pantalaimon, always by her side.

But the arrival of her fearsome uncle, Lord Asriel, draws her to the heart of a terrible struggle – a struggle born of stolen children, witch clans and armoured bears.

As she hurtles towards danger in the cold far North, Lyra never suspects the shocking truth: she alone is destined to win, or to lose, the biggest battle imaginable.