'Survivor': The Final Four

Tears And Surprises Ahead In "Survivor" Finale

(CBS)  There's only one episode – and four Survivors – left. Who will take home the $1 million prize? The answer is coming in a special two-hour season finale of "Survivor: Palau," this Sunday night at 8:00 p.m. ET/ 7:00 p.m. CT, on CBS.

We'll find the Final Four rethinking their strategies when a once-solid alliance dissolves with the slip of a tongue. And, a Final Immunity Challenge promises a shocking development that will go down in "Survivor" history.

At Thursday night's Tribal Council on "Survivor: Palau," an obviously frustrated Caryn Groedel laid her cards on the table and sealed her own fate.

"I just wanted everyone on the jury to know what was happening," Caryn tells The Early Show co-anchor Julien Chen. "There was a lot of plotting going on that they didn't know about. The jury only gets to know what they see."

From her point of view, she had nothing to lose and everything to gain.

"I knew I was on the chopping block," she says. "I knew that Katie could not be trusted to keep her alliance with the women, that she was going to keep Ian on. She didn't have the guts to really send him packing, and I was going home and since I was going home, I wanted to lay the cards out."

It was also her last-ditch effort to save herself, forcing the tribe to face the truth, planting the seeds of doubt in Katie's head about her best friend, Ian.

"If Katie could hear that Ian had been plotting against her, then maybe she would vote for him to go home," she explains.

But just like she told Jeff Probst, at that point, she was fed up with the scheming and lies.

"Usually at Tribal Council, everyone is still playing the game, saying the right things, still making their moves. They are appealing to the jury," she says. "I'm angry there was so much deception and everyone was making it seem like everything is all happy and there was so much scheming going on."

But, then again, scheming has been, for most players, their game, so what sent her over the edge and made her expose the liars?

"I think it was Katie and Ian and the whole thing with: 'Oh, I'm so sorry.' Ian is saying I'm so sorry to Katie, and this whole love fest going on," Caryn says, "In the meantime, the women are talking about voting out the guys, and Ian is talking about voting out Jenn and then Katie. And I'm saying to myself, 'Come on. Let's be real here. Let's get the cards on the table.' "