In My Soul to Keep, Kaylee now has to save the world from Demon breath, the super-addictive Netherworld substance that can kill humans. Somehow, it has already made its way to the human world. Kaylee and Nash have to find a way to cut off the source and protect their friends - one of whom is already hooked. Unfortunately, so is someone else. 
 So once again, Kaylee has to go save the world again. On one hand, it's pretty interesting; the different messes she gets into and how she gets out of them but on the other, it's starting to get stale. I don't feel that there is much progression on the part of the story as well as characters. It's like two steps forward, one step back. 
 My Soul to Keep's redeeming factors, I suppose, are Tod and Nash and Kaylee's relationship. Tod because at least he's different and entertaining and I genuinely want to find out more about him. As for Nash and Kaylee's relationship, I must admit, I'm getting tired of it. Yes, yes, they're the perfect couple. No one can ever tear them apart because they're both bean sidhes and that's a bond no one can break. I say it's one of My Soul to Keep's redeeming factor because in this installment, their relationship takes a beating. There are huddles to cross, barriers to overcome, and it becomes interesting for a change. 
 It's not that difficult to guess the "climax" of the story, unfortunately and the ending, while a little cliffhanger-ish, is nothing to rave about. I'll most probably continue with the series, only to see if it'd improve. 
 P.S. I know swirling eyes are how bean sidhes emote but I get it, I get it. Eyes swirling with excitement, Nash's excited. His eyes swirling with mischief, he's mischievous. I don't want to see any more eye swirling. *facepalm* How do eyes swirl with excitement, or mischief anyway?