Earth's past history holds all hope for saving the Universe from annihilation by The Dark. The key is one young teenager from ancient Cemanahuac named Citlalli. Ahead of her lies time travel, a ruthless evil, burning at the stake, and facing her own death. All her previous intergalactic adventures have led to this ultimate confrontation between the forces of Light and Dark, Good and Evil. Citlalli and the Dark is the fourth Blue Third adventure and takes us on an amazing journey across space and time.