I think what disappointed me most about this book was that Kate started out as a really strong character in the first book, and even in this one she returns to the Underworld after spending her Summer in Greece. She seemed independent and capable. But the second she returned to the Underworld that all went away. She got back and turned into this girl who defined herself by her feelings for Henry. At one point she said, “without Henry, I didn’t know who I was anymore,” and it really bothered me. Then, during the fight with Cronus, she basically just got in the way and then <spoiler> got captured </spoiler> in what felt like a really stupid way. Since Kate was the main character and we see this story through her eye I really wanted to see her be the hero of her own story a little more.
She and Henry did have some time together at the end of the book, but then he went on to deal with more god-business that Kate was again left out of, and seeing her character become so dependent on him was really disappointing.