I agree with most of the people that the first book in the series was better than "The Infinite Sea". But even though this one is more serious and less Cassie-funny, I really liked reading through Ringers eyes. I missed Evan and Cassies interaction from book 1 a little bit but you get enough good moments in the book to see past that. And the story grew bigger than only those two characters. 
 Overall I loved reading the sequel and I'm excited to see how the author wraps it up in the last book.