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The mummified body of an old woman is found in the victim's closet. It was clearly no accident, and the woman was clearly alive when she was entombed. As Grissom (William L. Petersen) investigates, other CSI members look into a case involving a break-in, a teenaged girl, and a rape -- a case that has more in common with the aforementioned death of the old woman than first meets the eye. Likewise linked are two separate investigations conducted by Catherine (Marg Helgenberger) and Warrick (Gary Dourdan), both involving the same weapon.