Once I got over the shock, I did enjoy the book. It had the POVs of Hera/Calliope, Aphrodite/Ava, Persephone, Hermes/James and Hades/Henry in that order. Starting with the end of the titan/god war and ending just before Kate meets Henry. I guess it is a prequel of sorts and it sorts out a few things mentioned in the other books and helps us to understand every character's path. Quite good overall.