His Dark Materials 3: The Amber Telescope

In Lyra's world, science, theology, and magic are intricately intertwined. When her best friend disappears, Lyra sets out to find him and uncovers a conspiracy. She must discover the truth behind the mysterious "Dust." Along the way, she receives help from Will, who possesses a special knife that can open windows between worlds. Gradually, Lyra and Will uncover the truth about Lyra's origins. She increasingly senses that the answers to her questions can only be found in the realm of the dead. Against all odds, Will and Lyra descend into this most terrifying of worlds, determined to atone for an old debt and fulfill a prophecy. They know that greater dangers await them at the end of this path, as the most powerful prepare for the decisive battle between good and evil.

About the series: The steampunk trilogy "The Golden Compass" chronicles the adventures of Lyra, a girl from a Victorian-like parallel world, and Will, a boy born in our world. Philip Pullman skillfully blends fantastical realities with human existence, scientific insights with religion and shamanism. The three audiobooks focus on themes of growing up, knowledge, and responsibility.