The House of Hades: The Underworld Saga, Book Four

Just when things were looking up for Than and Therese, everything crumbles.

The Underworld is attacked, Therese and her friends are crushed, the souls are unleashed, and a malevolent goddess threatens to unhinge Mount Olympus.

And Hypnos unwittingly puts Jen and her family in harm's way.

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Can Hip, Than, and Therese save the living and the dead?