It's "Down to the Wire" when TOM SIZEMORE guest stars on tonight's episode of "CSI: Miami," playing Private Investigator Kurt Rossi -- and Horatio Caine (DAVID CARUSO) has to do his best to save his team!

"My gentleman, Rossi, will do whatever it takes. He will win dirty, he will win ugly, he will win gloriously -- he just wants to win," Tom tells ET.

But Rossi doesn't know what he is doing when he takes on an opponent like Horatio Caine, who fights to protect his team, which is being slowly destroyed by the private investigator after a man is killed due to a fake 911 call.

"He is a thorn in my side. He is trying to implicate people and distract us from the mission, and he has been somewhat successful, but he won't prevail," David says.

The "Down to the Wire" episode of "CSI: Miami" airs Monday, May 12 on CBS at 10 p.m.