Hades and Persephone have a son, and he's feeling trapped in the underworld. Bion's one solace is his friend since childhood, Myrinne, a mortal girl who was adopted by Charon the Ferryman. When Myrinne is kidnapped during a jailbreak from the underworld, Bion's rescue becomes a chance to experience life in the sunlit lands. He promptly falls in with Spartans who are desperate enough to raise the dead to fight a looming Persian army. But meddling in a war the gods have sworn not to interfere with isn't likely to put him in Zeus's good graces -- and Bion needs the god's favor to help Myrinne, who's turning out to mean even more to him than he realized.
BACK ACROSS THE STYX mixes military history with Greek mythology and young love with gusto. A novella of 21,000 words.