For those Percy Jackson fans out there, the one year wait is almost too unbearable especially with a cliffhanger like the Mark of Athena.

The House of Hades, the fourth book in the second series of Percy Jackson: The Heroes of Olympus, is set to come out this year's fall season.

With the Mark of Athena ending as Percy and Annabeth drops into the dark depths of Tartarus, fans are all eager to know what will happen.

Would the seven demigods in the prophecy be completed? What about Percy and Annabeth's fate?

We can only know about it sometime in October.