Clark (Tom Welling) and Lana (Kristin Kreuk) each make an attempt on Chloe's (Allison Mack) life for unknown reasons after they receive a mysterious e-mail from the Sommerholt Institute. Clark must discover the source of these e-mails after Chloe reveals she has uncovered proof that they are doing mind-control research at the lab and realizes they must be trying to kill her in order to prevent her from writing an expose. Meanwhile, Lana decides to rent the apartment above the caf�© to Adam (guest star Ian Somerhalder) even though she feels he is hiding something dangerous about his past.