Anybody who actually loves the Gemma Doyle Trilogy will probably relish in this books with its cryptology, secret societies, and references to gods and godesses such as Amon, the god of fertility, and Isis, the goddess of fertility. And, like in the Gemma Doyle Trilogy, there is a certain struggle between men and women--theories and such like how the matriarchal society was thrown down in favor of the patriarchal society. Can't reveal anymore, but if you love mystery with cryptic messages, hidden symbolism, fascinating theories and flashback lectures given by the protagonist, Langdon, and even more mysterious characters, you're going to revel in Dan Brown's The Da Vinci Code.