CBS has released the promo for the new CSI episode "Unusual Suspects."

In this episode, a sister's stunning courtroom confession throws her brother's guilt into question. Blindsided, the CSIs must race to re-examine the case's evidence in order to determine which sibling is telling the truth, but begin to suspect that a more sinister scheme may be at work.

The 20-second promo can now be downloaded at CBS.com. For those of you with slower connections, here's a full transcript of the promo video:

CBS THURSDAY

[A little girl's feet dangle from a bench. Her name is Hannah, and she's just confessed to a murder.]

[Text-over: '4'3'']

[Her fingers are inked and her fingerprints are taken.]

[Text-over: '65lbs']

[Now her confession is being taken.]

[Text-over: '12-years-old']

[Hannah takes her jacket off. Though she's young she looks wise beyond her years.]

[Text-over: 'Killer?']

[Nick is at a court room. He looks shocked by something he sees off-camera.]

[Hannah talks to the investigators.]

Hannah: "You don't think I could've done it."

[She stands in a room with an officer and puts on an orange prison suit.]

[Text-over: 'Can a child genius...']

[Sara, Catherine, Warrick, and Nick are gathered together.]

Nick: "She's a prodigy."

[Sara addresses them.]

Sara: "Which means she has the brains for murder."

[Catherine and Warrick take this in.]

[In a field, a man uncovers the body of a young woman. The scene is sealed by police tape.]

[Flashback: Hannah arrives at a dance, wearing a pink dress. Everyone there is much taller than her.]

[Text-over: 'Outwit CSI?']

[Grissom is in his office, pondering the case.]

[Nick and Ecklie walk through the halls.]

Nick: "This is just a mixed up kid trying to protect her older brother.]

[Hannah hugs a boy who's much taller than her, her brother. She looks up at him adoringly.]

[She finds Sara in the hallway, and leans in to whisper something in her ear.]

Hannah: "Listen..."

[Text-over: 'This whisper...']

[Hannah pulls back to appreciate Sara's reaction.]

[Text-over: 'Holds the answer.']

[Sara looks at Hannah, shocked.]

[The screen turns green.]

[Text-over: 'CSI: TV's most watched show. New episode Thursday 9/8c.']

To view the trailer of this new CSI episode, head over to the official CSI website .

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