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Tana French's writing is impeccable. She adroitly captures the angsty essence of teenage girls, right down to their (slightly irritating) slang. The girls of Holly's little gang are richly drawn and slightly magical. There is an otherworldly element to them that adds an additional mystery-within-the-mystery. The real "Secret Place" is the clearing where the girls meet at night and how it strengthens the powerful bonds of friendship they have formed. The school holds secrets upon secrets, and its up to the detectives to break through the layers of deception. I particularly like how Moran and Conway quickly identify each others strengths and use those to resolve the crime. There is a slightly manipulative feel to their handling of the case that echoes the politics, the secrets, and the ambition of everyone involved.. The class distinction between the students and the detectives is superbly drawn: the students are indifferent to it, the detectives are keenly aware. Conway is bitter, Moran is slightly awed....initially. Like all of French's characters, Moran has a past, and uses the present to help resolve the issues that haunt him.
Frank MacKay, the protagonist of French's previous novel Faithful Place, plays a strong part as Holly's protective father. He is an appealing character, and it's great to see him again, along with Holly. My sole concern with The Secret Place is that the relationship between Moran and the MacKays will be confusing for those who are reading the book as a stand alone. For that reason, I recommend you read Faithful Place prior to reading The Secret Place.
I actually recommend all of the Dublin Murder Squad series. I was hooked with In The Woods (as fine a piece of writing as I have seen) and my enthusiasm has not dimmed. French is to be commended for keeping her series lyrical, fresh and mysterious.