Hades and the Helm of Darkness (Heroes in Training Series, Book #3)

Hades and the Helm of Darkness (Heroes in Training Series, Book #3) by Joan Holub & Suzanne Williams

P.U.! The underworld is a scary -- and stinky -- place. After a journey across the River Styx, Zeus, Poseidon, and Hades find themselves deep in the Underworld on a new quest by order of the Oracle at Delphi. This time they're searching for the mysterious Helm of Darkness. And for their friend Hera, who left the group to strike out on her own after their last adventure at sea.

Though Zeus and Poseidon aren't huge fans of the place, Hades takes to the Underworld as if he has always belonged there. The smell of sulfur doesn't ick him out, and the crocky-deads don't terrify him. But there is one thing he isn't a fan of -- a giant three-headed dog that could be friend or foe.

With magical water that erases memories, rivers of red-hot lava, and another epic battle against two Titans standing in their way, can these young Olympians locate the legendary helm, and escape the Underworld before it's too late?

Aladdin, Hardcover, 2013