J. J. Dashnaw

Anna and Summer are upset with Seth. Julie has love problems. Sandy helps Jimmy with legal issues. Kirsten's indiscretion is exposed. Ryan and Luke form an unexpected alliance.

Percy and Lasalle go undercover at a high-stakes, underground poker game after the organizer targets players with access to a naval research laboratory. Also, Laurel Pride (Shanley Caswell) visits her dad during spring break to discuss options after her upcoming graduation.

The team tackles their most unusual case yet: two murder victims within two weeks, both named 'Mac Taylor.' Now, Det. Mac Taylor, and 15 others with the same moniker, must determine the killer's motive before they strike again. (TV-14)

The CSIs investigate when a fraternity prank goes awry on Halloween and a pledge master is left for dead in an open grave. (TV-14)