The Book of the Gardener (en Inglés) - Lauren H. Brandenburg

The invitations have arrived! The heirs of the under-lands chosen! And the Arcs are ready to set sail on the glowing underground waters for Thalássiokípo, the most legendary, mysterious garden in the under-lands. But rumors of a new garden have surfaced-a garden formed deep within the darkest part of Earth, and with the sudden reemergence of the Delegation of Gardens, the safety of those attending the once in a lifetime Celebration has the Shamar on high alert. Meanwhile, Boone Tackett's cryptic visions have returned, Lewis is confronted with a deceptive transporter who seems to know more about her than she knows about him, and Orlo is cautioned that the whereabouts of Bednegraine are suddenly in question. When an unexpected announcement causes chaos to break out at the Celebration, Boone, Orlo, and Lewis find themselves on a quest, an epic journey through the under-lands, encountering old friends and facing old enemies, as they seek to find the truth that will save the gardens of the under-lands, a truth that can only be found in a book that doesn't exist-The Book of the Gardener.