Joan Holub has authored and/or illustrated over 140 children's books, including the Goddess Girls series, the Heroes in Training series, the New York Times bestselling picture book Mighty Dads (illustrated by James Dean), and Little Red Writing (illustrated by Melissa Sweet). She lives in North Carolina and is online at JoanHolub.com.
Suzanne Williams is a former elementary school librarian and the author of over seventy books for children, including the award-winning picture books Library Lil (illustrated by Steven Kellogg) and My Dog Never Says Please (illustrated by Tedd Arnold), and several chapter book and middle grade series. She also coauthors the Goddess Girls and Thunder Girls series with the fantastic Joan Holub. Visit her at Suzanne-Williams.com.
Craig Phillips has been creating cover art and drawings for books, comics, and magazines for nearly two decades. He is most at home working on tales about myth and magic. His latest book-Giants, Trolls, Witches, Beasts: Ten Tales from the Deep, Dark Woods-is a 200-page graphic novel about just that! It will be in stores in May 2017. When he is not drawing and writing, he likes to swim in the lakes and walk in the forests and mountains of New Zealand. Visit him at CraigPhillips.com.au.

Zeus and his friends try to free Briar, Kottos, and Gyes from Tartarus so they can finally beat Cronus once and for all in this Heroes in Training adventure.

The fourteen Olympians and Ron are headed toward Olympus. Ron is telling them the rumors that the Titans have all escaped Tartarus and are gearing up with Cronus for a final battle with the Olympians.

When they reach the sea, Oceanus attacks them by surprise. They are almost washed away by a tidal wave when mysterious woman appears and saves them. It is Gaia, the wife of Uranus?and grandmother to Zeus and most of the Olympians.

Gaia is on the side of the Olympians, partly because she believes that they will be better for the planet than Cronus, but also because she is angry with her son. He has imprisoned his three brothers: Briar, Kottos, and Gyes. She says if the Olympians free them from Tartarus, they will help the Olympians defeat Cronus. But can the three brothers be trusted? And can the Olympians defeat Cronus once and for all?