First, I would like to admit my defeat to Sophie Cleverly on tricking me into thinking Scarlet and Ivy was going to be a trilogy and then pulling a fourth book out of nowhere. I was played.
Moving on, The Lights Under the Lake was just as exciting and thrilling as the three books previous. It was also nice to have a break from Rookwood and see Scarlet, Ivy, Ariadne, and Rose interacting outside of the dark and oppressive walls of the school. Moreover, Cleverly answered the mystery of Rose in an exciting and mysterious way that kept me interested in the story to the end.
Ariadne remains my favorite character, with her kind and loving, happy-go-lucky attitude that is combined with humor and ever-surprising detective skills. I appreciate how Cleverly makes sure that every event that happens to Scarlet and Ivy has an believable and real effect on the twins; for example, Scarlet will always go back to her time in the asylum, which makes her brashness and recklessness have a check, making her not seem so unstoppable. Moreover, it affects the way she views other people's issues or her own abilities to do certain tasks. The same goes with Ivy. Near the concluding chapters of "The Lights Under the Lake", Ivy thinks she has lost Scarlet yet again, and the way Cleverly describes that is so strong that you can definitely feel the emotion. The difference between that raw hurt and fear, and the numb sadness we knew in Ivy in the first book is so accurately portrayed.
Overall, I enjoyed the fourth installment, even though I didn't expect it. Cleverly is talented and creates compelling stories about girls being girls. I still appreciate that there has never been any male characters thrown in to create drama. It's not until I think about it afterwards that I notice the lack of male characters, but it never makes the books feel like they're missing something. The book is about girls solving mysteries; it's about sisterhood and friendship; and all of that Cleverly easily accomplishes it without the typical romantic relationship dramas.