Spirit Walker is the second book in the series Chronicles of Ancient Darkness written by Michelle Paver and illustrated by Geoff Taylor.

The plot follows Torak and his friends travelling to the mysterious Seal Islands to find a cure for a terrible sickness circulating throughout the forest in which they live.

Spirit Walker is preceded by Wolf Brother (2004), and followed by Soul Eater (2006), Outcast (2007), Oath Breaker (2008), Ghost Hunter (2009), Viper's Daughter (2020), Skin Taker (2021), and Wolfbane (2022).

Renn and Wolf meet some members of the Sea Eagle Clan, who take them both to the Seal Islands, and learn that a taboo act has been committed: an orca has been killed.

When Torak informs the Seals of the sickness, he learns that it visited their islands two years earlier, and their mage, Tenris, promises that a cure can be made.

Kirkus Reviews highlighted how "Paver incorporates vivid descriptions of her characters' woodcraft and other skills, as well as credible views of their oneness with the natural world and animistic beliefs – details that enrich her complex tale without impeding its quick pace.

[3] Spirit Walker has been published in a variety of different languages, including Dutch, French, German, Italian, Norwegian, Korean, Japanese, Polish, and Swedish.