Warning! If you haven't read any of the series yet, there will definitely be spoilers, so you might want to stop now!!
We left off with Kate being pregnant with Henry's child, thanks to Ava working her powers. But Calliope now has Kate held prisoner at Cronus's palace, or island where he escaped to from Tartarus. Kate doesn't think that Henry knows she is pregnant with his child, and Calliope intends to take the baby and then kill Kate. But Cronus is grateful for the little bit of kindness that Kate had shown him when he was able to escape, and wants to keep her as his queen, even as he intends to take revenge on his children, and probably ultimately destroy the humans. Kate must figure a way to help the council fight him. But also she now wants nothing more than for her child, who she names Milo, to be safe. Even if she never gets to see him, if she must sacrifice herself to be Cronus's partner, as long as he gets to be with family, Henry, her mother, then she will be happy. However, without Calliope, and Ava who is there with Calliope, seeming to be her partner, the council is not sure how they can beat Cronus. Ava says she is on their side, only there to try to save Nicholas, Calliope's son, and Ava's husband. While Kate is able to escape with the help of Ava, she is unable to take Milo with her. And now must scheme to figure out how to save her son. She also must figure a way to save Henry, as Calliope was able to injure him with a weapon that Nicholas helped her forge, that will kill the gods. So while the council wages small battles, and searches for other gods on earth to help them fight, Kate goes after other Titans to try to find a cure for Henry. If she can save Henry, then she can go to be with Cronus knowing Milo will be with his father. But like all of the Goddess Test books, there are twists and turns at all points, and it is not at all predictable. There are deaths at the end, some good, some sad. But in all a good ending. Although, I think there is some stuff I wouldn't mind seeing continued on in future books. Hint hint.
All in all, if you haven't picked up this series yet, you need to get busy! Once this book comes out, you'll be able to read them all right in a row, without even having to wait in between! Another great story, while not my favorite of the whole series, Carter once again does not disappoint!!