See Also: 'Bloodlines' Episode Guide

CSI: Crime Scene Investigation's fourth-season finale will reportedly wrap up two of this year's story arcs.

The episode, entitled "Bloodlines", revolves around five brothers, one of whom is suspected of raping a woman, Linley Parker, by the side of the highway. Set against this difficult background is Nick and Sara's competition for promotion and Greg's desire to get out in the field full-time.

In two of this season's early instalments, "Invisible Evidence" and "Feeling the Heat", it was revealed that Nick and Sara had applied for a promotion to the same "key position". At the end of "Eleven Angry Jurors", Grissom recommended Nick for the promotion. According to CSI Files sources, "Bloodlines" will reveal that Nick has indeed been given the position after Grissom gave him his seal of approval.

Greg Sanders has also been angling for a promotion of sorts. He's been desperate to get out of the lab all season, rejoicing when he's been allowed to help out in the field, as he did in "Assume Nothing" and "After The Show". In the season finale, Greg's analysis will reportedly play a pivotal part in solving the case, leading him to confront Grissom about his status.

Unfortunately, Greg picks a particularly inopportune time to talk to his supervisor. When the lab tech asks whether or not he will be allowed in the field full time, Grissom receives an important page and has to leave urgently. Greg stops him, telling the lead CSI he wants an answer regardless of whether it's yes or no. Grissom, who is clearly unsettled by his page, says that Greg can become a field CSI on one condition: he must find someone to replace him in the lab.

Greg's got his answer, but one question remains unsolved — what has Grissom all shook up?

Please note that the above plot details have not been confirmed by CBS, Alliance Atlantis or Bruckheimer Films, and until such time you should treat this information as you would any other rumour. The above information comes from an early draft of the script and details may change before the episode goes to air.

"Bloodlines" will likely air on May 20, 2004.

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