A perfectly fine YA book, although without some of the broader age appeal that the Bartimaeus trilogy had, in my opinion. The plot was a good introduction to the teens at Lockwood & Co., with enough character development to leave the reader interested in where the kids will go next in their adventures. I would definitely recommend this series to my younger cousin, or any middle grade/tween esque individual who likes spooky things and a group of ghost hunter teenagers. That being said, there wasn't enough in the book for me as an adult reader who still reads YA to feel compelled to continue the series. If I get in the mood for some low stake ghost stories and witty British banter, I might return to book two, especially considering the tease that the end of this book left, but for now I will give it a pass.