Oh, that's an easy one for any Riordan fan who listens to the audiobooks. The Kane Chronicles audiobooks, including 'The Serpent's Shadow,' are narrated by Katherine Kellgren and Kevin R. Free. But here's the cool setup – it's not just a single narrator for the whole thing. Since the books are told in first person, alternating between Carter and Sadie Kane, the audiobook uses a dual-narration style. Kellgren handles Sadie's chapters, and Free takes on Carter's.
What I love about this choice is how it adds to the experience. Kellgren absolutely nails Sadie's sarcastic, witty, and often exasperated teenage voice. You can hear the eye-rolls. Free gives Carter this great, more measured and thoughtful tone that fits his character perfectly. It really emphasizes the sibling dynamic that's central to the series. They played off each other so well, especially in the chapters where the characters are supposedly recording over each other's parts. It makes the listening experience feel way more immersive than a standard single-narrator read.
Some people find the switching a bit jarring at first, but I got used to it fast. Honestly, after finishing the series, I can't imagine it being done any other way. It's a production choice that respects the source material's format.