The rock alphabet explores the linked tales of Ivy and Flin, whose paths cross in Ivy's quest for mysterious rock paintings that have gone missing. Both are misplaced young people who struggle to fit in; their stories explore loss, memory and reclamation, and how the past is entwined in the present. When Flin is only a few years old, he and his older brother are discovered wandering in a remote mountain range by Beattie Fro, daughter of a renowned archaelologist. Although aloof an unmaternal, Beattie brings the children home. But the silent older brother is difficult, and runs away to the mountain; fatefully Beattie follows. Flin is haunted into adulthood by the voice of his brother, calling him back to the feared wilderness.