Minute of Silence (S03E09)

Kiera, hindered by her tenuous relationships with both Carlos and Alec, pursues a group of brilliant students, who are using cutting-edge technology to commit crimes. Meanwhile, a handsome amnesiac known only as John Doe tracks Kiera down in an attempt to piece together his mysterious past. Alec crosses a line in his desire to perfect his new invention - and Kellogg worms his way back into Alec's good graces. (iTunes)