With missing friends and mysteries abound, Liz returns tofringe science, but in working alongside her new mentor,she's confronted with an unsettling revelation and a difficultchoice, meanwhile, Maria uncovers the truth behind the"messages" she's been receiving. Elsewhere, thebond between brothers is tested when Max keeps an explosivesecret from Michael, putting them at odds during a criticalmoment. Lastly, Isobel tries to pull answers out of Tezca,only to discover that the villain in her story is not asclear-cut as she may seem.