The Heroes in Training are entering the Underworldif Hades can conquer his canine fears, that is. The Underworld usually isn't really meant to be a fun placebut tell that to Hades! He loves the dark and the stinky smell of sulfur. However, there is one thing that Hades is not a fan of: dogs. And when Zeus and his fellow Olympians encounter Cerberusa snarling, three-headed dogHades must conquer his fears and tame the hound so everyone can continue into the Underworld and deposit their Titan prisoner, Oceanus, back where he belongs! But with magical water that causes forgetfulness, hot beds of lava, and another epic battle with two more Titans standing in their way, will Zeus and his heroes make it out of the Underworld with everyone intact?

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.