I'll never be free of her. I wear her face; as I get older it'll stay her changing mirror, the one glimpse of all the ages she never had. I lived her life, for a few strange bright weeks; her blood went into making me what I am, the same way it went to make the bluebells and the hawthorn tree 
 Some books hurt. They squeeze your chest, they make your eyes sting with unshed tears. It's a rare author who is able to evoke that kind of emotion in their readers, and I can only say that reading Tana French always brings a stab of exquisite pain to my heart. 
 It's ridiculous, really. It's so incredible. She is one of my favorite authors, and for me, there's just no words for how stupidly wonderful I find her books, because I have not the talent with words that she has. I can't adequately sum up my emotions for her books except to say, from the bottom of my heart, that I love them, utterly. 
 I have the shortest attention span with books. I read them once. I enjoy them, or not. I forget about them. Re-reading anything is a rare, rare, rarer than once-in-a-blue-moon event with me, and yet I've found myself going back to her books time and time again. Exquisite. I can't describe it as anything less than that. 
 Like Rob Ryan in the previous book in this series, our main character, Cassie Maddox is broken. Broken, damaged characters within literature are a dime a dozen. It is up to the skill of the author to make them truly believable, and I fell in love with Cassie as I did with Rob. She feels like a sister, someone I want to hold and protect against the harshness of the world. Like Rob, Cassie has a darkness inside her that made her former position with the Undercover squad so exhilarating. 
 Some people are undercovers all the way to the bone; the job has taken them whole. 
 I was never afraid of getting killed and I was never afraid of losing my nerve. My kind of courage holds up best under fire; it's different dangers, more refined and insidious ones, that shake me. But the other things: I worried about those. Frank told me once--and I don't know whether he's right or not, and I didn't tell Sam this either--that all the best undercovers have a dark thread woven into them, somewhere. 
 This book is about Cassie. Yes, we get a few brief mentions of Rob, but he is not the focus. This is a good thing, because it shows that Cassie is strong, she is able to move on, and this, after all, is her story. 
 They say that everyone has a double, somewhere; Cassie may have found hers, only that twin is dead. Her former boss, Frank, with his rather sadistic and unconventional streak, wants Cassie to go undercover as the dead girl. Infiltrate an impenetrable group of friends - and the thrill, the need for an answer is too much temptation for our girl. She goes into it with trepidation, excitement. 
 And beyond all expectations, Cassie finds so much more than a mystery to be solved. 
 It was as if none of the jagged edges had ever existed; it was close and warm and shining as that first week again, only better, a hundred times better, because this time I wasn't on the alert and fighting to get my bearings and stay in place. This time I knew them all by heart, their rhythms, their quirks, their inflections, I knew how to fit in with every one; this time I belonged. 
 This is a story about love. About the love of friendship and family, arguably more important than romantic love itself. Anyone who has never felt like they belonged will know this feeling, that there's nothing like the feeling of finding your place among others, and that's what Cassie finds here. 
 I know I am doing a shit job of describing the book. There is just so much depth to it that I am out of my depths trying to describe it. Just please, please, read this and judge for yourself.