While experimenting with a new form of radio, Jason Gridley receives a transmission from the inner world of Pellucidar in which Abner Perry reveals the capture of David Innes, leading into the adventures of Tanar, a young warrior taken prisoner during the conflict with the Korsars. After meeting the mysterious Stellara aboard a Korsar vessel, Tanar escapes with her and crosses strange islands and dangerous lands, surviving hostile peoples and prehistoric beasts as their shared hardships gradually deepen into love. Their fragile freedom is shattered when the Korsars reappear and treachery separates the pair, sending Tanar once more into a desperate struggle to recover Stellara.
