I have the pirated Full Cast audio books. After book 3, they slowly get worse. First 3 I can defend as simple kids solving over the top mysteries. Reminds me of the Enid Blyton and The Secret Seven books I read as a kid.

But the casual elf slavery. Dumbing down politics for kids. The torture being used for detention in book 5. Pushed me enough to buy the inkheart audio books.

There are probably other books for teens that have magic and fantasy, but I am reccomending Inkheart by Cornelia Funke right now.