Board Thread:Spoilers!/@comment-26443838-20160111023755/@comment-27060727-20160325201443

I think in 5x16, 5x17, and 5x20, there were set pictures of Hades holding a piece of paper - most likely a storybook page. He hands it over for them to look at in 5x20. So whatever the heroes are looking for, Hades probably has it at the moment.