Tally has been kidnapped. Her older sister, Lady Élanor has asked teenager Wil Calloway for help but he returns to Saran to discover tensions that threaten Tally's rescue from the start. Accompanied by his three best friends and three huge Fellhounds, Wil makes a promise to bring Tally back before the twin moons cross. But the journey to Armelia is beset with challenges - not least being getting in and out of the city!