The bodies of teenagers Toby Wellstone and Jill Frommer are found a half-mile apart in the Hell's Gate region of Death Valley. The curiously arranged evidence suggests that the teens died in a Romeo-and-Juliet suicide pact, but Sara (Jorja Fox) and Warrick (Gary Dourdan) refuse to rule out the possibility of murder. Meanwhile, Grissom (William L. Petersen), Catherine (Marg Helgenberger), and Nick (George Eads) investigate when equestrian trainer Lori Hutchins is trampled to death by a horse -- on a private 747 jet, bound from Belgium to Las Vegas. ~ Hal Erickson, Rovi