His Dark Materials

His Dark Materials is a trilogy of fantasy novels by Philip Pullman consisting of Northern Lights, The Subtle Knife, and The Amber Spyglass. It follows the coming of age of two children, Lyra Belacqua and Will Parry, as they wander through a series of parallel universes.

The novels have won a number of awards, including the Carnegie Medal in 1995 for Northern Lights and the 2001 Whitbread Book of the Year for The Amber Spyglass. In 2003, the trilogy was ranked third on the BBC's The Big Read poll.

Although His Dark Materials has been marketed as young adult fiction, and the central characters are children, Pullman wrote with no target audience in mind. The fantasy elements include witches and armoured polar bears; the trilogy also alludes to concepts from physics, philosophy, and theology. 

It functions in part as a retelling and inversion of John Milton's epic Paradise Lost, with Pullman commending humanity for what Milton saw as its most tragic failing, original sin. The trilogy has attracted controversy for its criticism of religion.