I Love a Mystery follows the line between Shadow and Lycra. Try your hardest to avoid wandering into either of these other routes. It's most commonly done as a top rope from the Shadow anchors.
Between Shadow and Lycra. Look for the big dimple/dish a few moves off the deck and climb straight up to it.
While most-commonly done as a top rope, I Love a Mystery can be lead by traversing left after the first few moves, clipping the first bolt of Shadow, and traversing back "on route." The next bolt that can be clipped is the fourth bolt of Lycra.