If you love Celaena and would like to learn more about her and her past this is the book to read! 
 I read this originally just before the 2nd book but you can read it anytime really, it sheds a lot of light on some situations and it's just fantastic. 
 For a novella this is so damn great, there was no stories that I absolutely hated or bored me to tears, all of these were interesting and meaningful plot wise, it shows us how much Celaena had grown and how awesome she really is even as a 16 year old smart ass!