Blue Labyrinth: Preston and Child

I loved this book, like a labyrinth there were so many twists and turns it was hard to keep up with what was happening. FBI agent Pendergast opens the door one night to find one of his twin sons deposited there dead. He chases a car for a while, but loses it and his son's killer. Once the body is autopsied, a rare turquoise is found in his stomach. Pendergast has a hard time picturing that Alban could be murdered because he had the ability to see a little into the future and wouldn't have walked into a trap. With the help of some museum curators on the origin of the turquoise, Pendergast goes to the Salton sea, to a mind there and falls into a trap. He is hit with a powerful drug that makes him smell tulips. He learns this poison he was given was actually a "medicine" his great grandfather made "Hezekiah’s Compound Elixir and Glandular Restorative". The medicine was supposed to make a person more energetic, but it ended up causing dependency and killing them. Constance and Margo try to find a cure before Pendergast dies, but are thwarted by Balboa who poisoned Pendergast and also wants to know the cure. Balboa was taking revenge because Aldan made him aware that the genetic deformity Balboa's son died from was because his grandparents were neighbors to Hezekiah's and they were given the elixir. Before both grandparents died they had a child who carried the results of the elixir on to the descendants. Margo and Constance are able to save Pendergast and Balboa goes to jail.