Emerald & Amber - Zaeyen — Sue Perkins

Zaeyen's marriage to a neighbouring duke's son is intended to save her father's estate, but the groom is cruel and threatens his betrothed. Zaeyen believes if she finds the Eos, who disappeared many centuries ago, t will save the planet and there will be no need for her to marry. She goes in search of the ghost like Eos and on her way meets Kade, a hero of the common folk. Kade joins her in the search and they battle through thirst, hunger and capture to reach their goal. The planet of Hejmen is dying and only the Eos can revive it, but do the spirits still exist and if they do, will they be willing to help the humans?