Katherine Kelly Lang and Heather Tom
"The Bold and the Beautiful" stars Heather Tom and Katherine Kelly Lang, who play on-screen sisters in the long-running soap, pose for a photo dated Aug. 11, 2016. katherinekellylang/Instagram

Drama reaches fever pitch as “The Bold and Beautiful” (“B&B”) delivers its first salvo for the week. On Monday, Brooke (Katherine Kelly Lang) lashes out at Katie (Heather Tom), who reported a sexually charged moment that she witnessed.

Brooke is not pleased to hear the notion that her fiancé may be cheating on her with another woman. While Katie insists that she’s acting out of concern, Brooke reckons her sister just wants to burst her happy bubble. Other “The Bold and the Beautiful” characters who will appear prominently on the upcoming run include Eric (John McCook), Quinn (Rena Sofer) and Ridge (Thorsten Kaye).

Spoiler Alert! This article contains "The Bold and the Beautiful" spoilers. Read only if you want to know more about it.

TV Guide reports that on Monday’s episode of “B&B,” Eric, Ridge and Brooke are over the moon as they savour the recent good things that happened with their family. Katie, on the other hand, doesn’t take it well when her sister reacts negatively toward her notion that something’s going on between Quinn and Ridge. The show posted a preview video for the March 13 episode. It features multiple scenes with Quinn, Katie and Brooke.

Quinn opens the clip as she wishes Katie would stay out of her business. Later, Quinn accuses Katie of having a sinister agenda, as she asks, “Are you trying to make up something in your mind that you can take to Eric to turn him against me so you could have him all to yourself?”

Katie also figures in another scene as she defends herself. “This has nothing to do with old wounds,” she tells Brooke. “This is about what I saw between the man you’re going to marry and his father’s wife.” However, Brooke blows her top as she replies, “I certainly don’t need my sister coming up with these dangerous accusations especially days before my wedding.”

"The Bold and the Beautiful" recap

Last week, Ridge and Quinn continued with their flirty banter, unaware that Katie’s watching them. Soon enough, however, Quinn noticed Katie, who stammered about leaving her phone there. Once alone with Ridge again, Quinn wondered how long Katie was watching them. He reassured her that Katie’s not a problem. Meanwhile, Katie went back to the studio and spotted her sister wearing a wedding gown. Brooke looked so happy as she looked forward to marrying Ridge but noticed that Katie’s uncomfortable. Katie revealed what she saw and commented that Quinn and Ridge’s interaction was kind of intimate. Brooke was shocked when she realised what Katie’s trying to say.

In another office, some members of the Forrester Creations team appeared to help Pam with the surprise wedding shower for Steffy (Jacqueline MacInnes Wood) and Liam (Scott Clifton). Later, the couple walked into the room and everyone jumped out and yelled, “Surprise!” Pam (Alley Mills), Charlie (Dick Christie), Nicole (Reign Edwards), Rick (Jacob Young), Maya (Karla Mosley) and RJ (Anthony Turpel) congratulated the future bride and groom and offered them a toast. Peals of laughter filled the room as Steffy and Liam opened their novelty gifts. Later, the couple thanked everyone for their touching gesture.

Find out what happens next on “The Bold and the Beautiful,” which airs every weekday on CBS at 1:30 p.m. It also airs every weekday at 7:30 a.m. on the TEN Channel in Australia.