[ Published in hardback as THE DEVIL'S ELIXIR.] 'I'm in trouble. Something terrible has happened.. .I didn't know who else to call.' An unexpected phone call from three thousand miles away. A voice he hadn't heard in more than five years. A desperate cry for help that he couldn't ignore. & two small words that would change everything about his life. FBI agent Sean Reilly & archaeologist Tess Chaykin are back in another edge-of-your-seat thriller that reaches from the present day back to 1700s Mexico & quite possibly far beyond...