Charlotte and her British cousin, Zee, find themselves in the Underworld trying to stop Poseidon's grandson, Philonecron, from stealing people's shadows and over throwing Hades.
Philonecron is probably the greatest evil geniusvillain of all time.
Funny. Relatable likeable characters. Very good.
The book is set in Minnesota and the door that they use to get to the Underworld is in the Mall of America. I like that:)