Here's why it's a good choice:
* Exciting Adventure: The book is full of action, danger, and mystery, keeping young readers on the edge of their seats.
* Intriguing Characters: Lyra Belacqua, the main character, is a strong, intelligent, and resourceful young girl who you'll root for throughout the story.
* Thought-Provoking Themes: While the book is fun and exciting, it also explores ideas about free will, religion, and the nature of good and evil. This makes it a book that can be enjoyed on multiple levels.
Other options:
* "The Book of Dust" trilogy: While this series is newer, it's set in the same universe as "His Dark Materials" and features many of the same themes, although it's aimed at a slightly older audience (teens and adults).
* "The Salmon of Doubt": This collection of essays and short stories by Pullman offers a glimpse into his thoughts and writing style, and it could be interesting for a twelve-year-old who enjoys reading about creative process.
Keep in mind: "His Dark Materials" does involve some potentially challenging themes, such as death and religious conflict. It's always a good idea to preview the book before letting a child read it to make sure it's appropriate for their age and maturity level.