She's been concerned that Quinn (Rena Sofer) is threatening her to stay away from Eric (John McCook), and is as worried about him as everyone else, and after hearing Quinn tell Liam (Scott Clifton) he was going to lose Steffy (Jacqueline MacInnes Wood), Katie (Heather Tom) will begin forming a plan to try and take Quinn down for good on The Bold and the Beautiful.

Katie will enlist Brooke's (Katherine Kelly Lang) help as she forms her plan, telling her sister what she overheard Quinn say to Liam, speculating on what she actually meant.

"Was she threatening to harm Liam, or was she just saying she was going to try to break them up so Wyatt could move in?" She asks Brooke in a preview clip for the Monday, Dec. 19 episode.

Quinn was telling Liam that she and Eric (John McCook) were firmly behind Steffy reuniting with Wyatt (Darin Brooks) over Liam, and she wanted him to know he should enjoy his last days with her since he wasn't really a match for the team Quinn and Eric made. Katie overheard the last days comment, which is what makes her wonder about Liam's fate as far as Quinn is concerned.

Then, as she and Brooke once again agree that Quinn needs to be stopped, she will start to form a plan to take her down, knowing that in order to really expose Quinn to Eric and convince her to return to her normal behaviors, she will have to manipulate things. But when Brooke expresses concern for her sister's safety, Katie will assure her she knows what she's doing.

"We've got to let Quinn think that I am her champion," she says in the clip. "I'm never going to forget just how dangerous that woman is."

The Bold and the Beautiful airs Monday-Friday at 1:30 p.m. on CBS.

Tags: The Bold and the Beautiful CBS Soap Operas