She needs to find out where her soon-to-be ex-husband has stashed their son, and despite her sister's involvement in their marriage falling apart, Katie (Heather Tom) will find an unexpected ally in Brooke (Katherine Kelly Lang) as her battle against Bill (Don Diamont) continues on The Bold and the Beautiful.  

Brooke's affair with Bill led to the demise of the marriage, as the situation brought Katie back into a depressive state that was complicated further by drinking. Because he doesn't want her to get the upper hand during their second divorce, Bill took their son, Will, and is keeping him away from Katie. Now, he will be stunned when Brooke of all people shows up to his office, demanding he stop the nonsense and give Katie her son back.

"Keeping Will from his mother is wrong, and I'm not going to let you do it," she says in a preview clip for the Thursday, July 21 episode. "I won't allow it."

Katie too will show up at Bill's office, demanding answers about where her son is, ignoring Brooke as she berates Bill for keeping their child away from her.

"What have you done with him? Where is my son?" She asks.

Bill however, will ignore the pleas and the threats of both women, maintaining that he is the one who will hold onto his son this time around, and an enraged Katie will continue to blame Brooke for her role in the mess. However, desperate to regain her sister's trust and a relationship with her again, Brooke will shock Katie when she pledges loyalty to her, and insists on helping her get Will back from Bill.

"I am here because I am determined to fix this!" Brooke says to her in the clip.

And though Katie may be rightfully weary of her sister, since they've been down this road before, she may decide she has no choice but to accept her sister's help if she wants even the slightest chance at defeating Bill.

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

Tags: The Bold and the Beautiful CBS Soap Operas