Since Gemma ran off with the sirens, Harper and Alex have teamed up to bring Gemma home no matter what it takes. They do some research on sirens but find no way to kill them or free Gemma. It seems almost impossible but Daniel also agrees to help. Alex puts up missing person ads all over the web and Daniel checks the newspapers. 
 Gemma is fighting against her siren nature as hard as she can but it is making her sick. She hates the sirens but suffers through to keep Harper and Alex safe. I'm not sure what I would do if I was Gemma. She is in a really bad position as she will need to feed or soon die. One of the sirens is somewhat friendly and helps her with advice on how to do this as few times as possible. The other two girls are horrible and selfish and enjoy the way they live. 
 Harper and Alex eventually get a lead to Gemma. Then a bit of drama occurs but like with the first book this isn't action packed. It is slow and steady and mostly full of emotions. Usually I'm not one for a slower read but I do love the relationship between Gemma and Alex and the beginning relationship of Harper and Daniel. I find the sirens gruesome and look forward to seeing how Gemma will break free of their bind. 
 --- 
 Daniel said. "Can you really afford to turn away somebody that wants to help you get her back? 
 Especially someone that doesn't think you're insane for believing in weird-ass bird-monsters?" 
 "Alex, you don't know...one trailed off, because if she kept talking, she would cry, and she didn't 
 want to cry. 
 "I have known for years," Alex said. "You've always been kind, considerate, smart, determined, and 
 stubborn. You have a good heart, and you'd never let anybody change you. That's part of why I fell in 
 love with you." 
 "My point is that nothing is unstoppable, and the T. rex wasn't as great as he thought he was. I mean, 
 what were those little arms for?" Marcy pulled her arms back into her sleeves, so her hands made short 
 imitation T. rex arms, and she wiggled them back and forth. "What an idiot." 
 --- 
 *I borrowed an ARC and this in no way affects my review*