 When a Greek shop owner is found gunned down, Crowley is surprised to learn that robbery wasn t the apparent motive -- the victim was petrified with terror even before the fatal shot was fired. The killer dons a nun s habit and walks with a profound limp. The only clue is a dried buttercup flower dropped next to the victim. When another family member is killed in the same manner, the team realizes a serial killer is at work, and the clues are designed to remind the victims of a dead or absent woman back in the old country, someone whom they wronged terribly and are now to pay the price.