Dear Internet,
I read His Dark Materials when I was a teenager and it changed my life. Lyra was a total inspiration for me, even if my personality might be closer to her dæmon Pan. The core premiss that humans have their souls walking around as animals called dæmons have kept my imagination going for 13 years now. When I am bored I will give people around me dæmons and imagine them in the room.
This will contain spoilers for the original series, but I will avoid big spoilers for the new book.
His Dark Materials (Northern Lights, the Subtle Knife and the Amber Spyglass) take place in a parallel universe from ours. Here people have dæmons, and the Magisterium (the church) has all the power. You cannot go against their teachings. In addition, the Magisterium seems to be terrified of children loosing their innocence. Of growing up, becoming sexually active and intellectually free. In the original book trilogy they try to stop children from growing up by separating them from their dæmons. Their very soul!