spoilers for the earlier ones.
Digger and Murai head off to find the monastery that might have knowledge. Grim Eyes is sent with them. It involves a guide who needs to be warned against tall tales, the Shadowchild conveying a prophecy from a slug and otherwise helping, deciding to go back and finding they can't, the impossibility of onomatopoeia for ethereal chanting, ghosts, jade-eyed dwarves, questions answered, and more.
Story tightens as the ending approaches.