The Fruitless Quest

It has been 50 years since the Battle of Manhattan, the Second Giant and Titan War, and the sun god's punishment, Apollo.
Demigods have gone, and gone.
After a tragic accident, Bernadette Townsend and Oliver Shannon, badly want to prove themselves.
With an impossible quest finally given to them by Zeus himself, Bernadette, Oliver, and new kid, Jamie Driscoll have to journey on to find one of the most hidden and inaccessible islands in Greek history, Ogygia.