I had an absolute blast with this book. It took me a while to finally pick up The Cuckoo's Calling (remembering how much I hated The Casual Vacancy in retrospect), but I'm glad I finally did. For the longest time, I thought that J.K. Rowling peaked with the Harry Potter series. Surprise, surprise, I was wrong! If not of the same caliber (just yet), The Cuckoo's Calling is great in its own right. I loved the mystery surrounding Lula Landry, and I grew to love the characters, even in the short time we were given to know them. 
 I only had two major issues: 
 1) The characters spoke a lot like her characters in the Harry Potter books (so many sentences and statements that were phrased as questions! When I saw that happening over and over again in all of the characters, I always thought of Ron or Hermione or you know, Harry Potter!) 
 2) Too many flashbacks that deter us from the main plot at hand (maybe it was necessary? but it was distracting and not that interesting. Hopefully now that we know Cormoran and Robin well enough, we won't have to read so much about their past in the next couple of books). 
 Overall, I loved most of it, and I'll be sure to follow Cormoran Strike's adventures! 
 Cheers!