Black Buddha, Pt. 1

S3, E1: When an airplane transporting a bombing suspect explodes, the victims of the tragedy include officers from Nick's department. Racked with guilt for letting his partner accompany the prisoner on the plane instead of going himself, Nick turns in his badge, ready to move on to a new life. But as bombs explode at police stations in other parts of town, and a device mysteriously turns up on his captain's desk, Nick rejoins the effort to catch the killer. Meanwhile, Tracy Vetter, the department's newest detective, encounters Vachon, the only survivor of the crash who somehow walked away from the crash even though his body was tagged as "dead." Eager to solve the bombing, she seeks out Vachon, discovering his secret to survival -- he is a vampire! Vachon, whose vamping abilities have been diminished by his still healing injuries, is unable to erase Tracy's memory of his secret and now must consider the only other means of silencing her.