User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-10218971-20130601022216

Every single paperback cover says Percy Jackson.

The Lost Hero: Return to Percy Jackson's world.

The Son of Neptune: Percy Jackson is back.

The Mark of Athena: Percy Jackson and Annabeth return.

House of Hades: Percy Jackon's deadliest adventure yet.

Look, Percy's awesome and all, BUT THERE ARE MORE CHARACTERS THAN JUST HIM!