This week on CSI: Reality Check Grissom, Warrick, & Sara investigate a bomb that detonated in a building lobby. A helpful security guard becomes a part of the investigation, but no one can really figure the guy out. Meanwhile, Catherine helps Nicky after he is implicated in the death of a friend. It's a bummer of an episode for everyone. Jordan & Night Shift Paige also talk about a murderous story Jordan wrote and Paige's dream of being a movie director.