The Titan in Chains (The Heroines of the Gods Volume 1)

Chaos is rising.
She's pitting the giants against the Titans in an attempt to distract the gods from what she was truly planning.
And only two heroes can stop the world from ending.

Now that Gabby has been uprooted from her home in Singapore and moving to Manhattan, she thinks things couldn't get any worse - but of course they do. A terrible tragedy strikes her family, and Gabby is forced to flee to Camp Half-Blood with her new friends - twins Dedra and Declan.
Dedra has always been in the shadow of her twin brother and feels that no one really sees her - even her own single mother. She has been hoping to find a sort of new normal while living at Camp Half-Blood. And yet, she either is the black sheep of her cabin or fades into the background.
That's why she jumps on the opportunity to join a new quest with Gabby and Declan to free the last person anyone will want to save from a rising - and familiar - enemy. But Gabby and Dedra have a feeling that someone even older and more powerful than anyone demigods have ever faced before was working behind the scenes.
And what alliances would Gabby and Dedra make to delay a full-scale war? What lengths will they go to in order to free the Titan in chains?