His Dark Materials Gift Set 'Northern Lights', 'the Subtle Knife', 'the Amber Spyglass

The trilogy follows the coming of age of two children, Lyra Belacqua and Will Parry, as they wander through a series of parallel universes against a backdrop of epic events. The story involves fantasy elements such as witches and armoured polar bears, but alludes to a broad range of ideas from fields such as physics, philosophy, and theology.