I've got your bleeding heart right here! 
 The Eternity Cure hooked me by the eyeballz and didn't let me go til the very end! Now I enjoyed The Immortal Rules but not like I did The Eternity Cure. For me this sequel was so much better than the first book! A lot of this has to do with Allie and how much she has changed since first becoming a vampire. In plain words, she isn't such a whiny nit anymore. Ok maybe she wasn't THAT whiny, haha. 
 Allie used to drive me nuts with how much she was fighting the instincts of being a vampire. You have to eat to live deary, no getting around it. In this installment she makes no qualms about killing to feed, luckily she just picks off the scum of the earth type humans. A good way to try and salve your conscience, I've read many a vampire fiction where the character goes this route. More power to them I say. 
 No one wants to root for a character that devours innocents for dinner now do they? Oh wait - do they? Well Hell YES - I DO! Because I have to tell you - I absolutely LOVE Jackal. If he had any sidekick henchmen openings I'd be signing right up - as long as I wasn't just some toady like all those other terds that were his underlings in The Immortal Rules. That's right we knew he was coming back, and boy is he playing a much bigger role in The Eternity Cure. All I must say about it, is Jackal is the kind of villain I love. He has his reasons and logic for the things he does and hey, to his crazy, selfish self they make complete sense. I can dig it, and I can't help but laugh at his sense of humor and enjoy every bit of quip and snark he throws Allie's way. 
 The mission, should they choose to accept it? Find and rescue their maker Kanin. Among other things along the way. Don't think you've seen the last of Zeke either. He's in here too of course, what would this be without a little side dish of star crossed romance? The downside...one character that I sooo could not stand makes a comeback here - for awhile anyway *evil laughter*. I'm slathering and giggling maniacally for the next Blood of Eden book!