[1][2][3][4] The Tenth City begins only a few hours after The Valley of The Thorns ends, just after the Dark Tower had crashed into the water and Alexa and her friends had escaped.
After they dropped Catharine in Lathbury and Balmoral in Castalia, Elyon sent the crew into the stormy waters where they learned of the secret cliffs beyond Turlock.
With Pervis's help, Alexa and Murphy crawled through the secret tunnel back to the library at Renny Lodge where Yipes was locked in a small cage.
When the lantern died out, they used the glowing orange Jocasta to light the way, but when they arrived, they were shocked to find that all the animals were gone, the lush forest had wilted and only the stones remained.
As Ander was telling Alexa that the last Jocasta would show them the way to the Tenth City once they reached Sly Field, they were surrounded by Grindall and his army of ogres and Odessa.
In a twisted, yet brilliant plan, Alexa and Murphy managed to fool and free their world of the terrible forces of Abaddon, Grindall and his stinking ogres before they could destroy Elyon or the Tenth City.