Journey down, into the depths of the earth, to meet the plants of the Greek Underworld — the trees, flowers, herbs, and shrubs that ancient Greek mythology associates with the Realm of the Dead. Along the way, we meet the Underworld rivers and entrances to Hades; learn about the sacred kykeon of the Eleusinian Mysteries; discover a shocking truth about Persephone's connection with the seasons; and meet the botanical allies for navigating through death, grief, and the Unseen Realm.