When a man is stabbed by an attacker dressed as the spirit of death, Danny investigates a voodoo community; Garrett tells Frank about a dark secret; Nicky and Erin take Jack and Sean trick-or-treating.
When a monster appears that resembles Molly’s childhood imaginary friend, Diana realizes her daughter’s life as a Witness will be anything but normal. Meanwhile, Molly gets her chance to see the vault for the first time.
Will starts teaching guitar lessons, but ends up having a fling with a student's mother.