The Shadow Thieves by Anne Ursu

Zee goes to see his Grandmother for the summer,  while he is there she passes away; with her last breath she says that Zee will save the world.  Soon sickness starts to spread.  He is sent to stay with his cousin in America to escape the disease.  Together they discover the cause of the sickness.  Meanwhile in the Underworld, an evil god, Philonecron, plans to over throw Hades.  Zee and his cousin, Charlotte, must go down to the Underworld and save it.

I liked this book because it has so much detail you can see the "movie" in your head while you read.  Charlotte and Zee are pulled into exciting adventures.  Readers who like the Percy Jackson series should checkout The Cronus Chronicles.

     ----Andrea