There's a serial killer on the loose in Las Vegas. Since this is a very high-profile case, the sheriff brings in the FBI to help. This annoys Grissom very much as the FBIs like to assume many things while he prefers to let the evidence speak for itself. Due to his refusal to cooperate, he is taken off the case. Grissom's team, however, knows better and keeps their boss informed on the details.
—Ploy P.