If you liked Labyrinth because of the more female-centric Dan Brown type of story, you absolutely should check out Katherine Neville's The Eight. It's an amazing complex book with an incredible heroine and it was written in the 70s/80s but has much in common with the themes/general adventure of and is often likened to/considered a superior precursor of The DaVinci Code. I've met Katherine a few times in person too and she's pretty fantastic. She was one of the few women working in international banking in the late 70s/early 80s when the book was published and she weaves that into the novel as well. :)