We see her place a call to someone and tell this individual about Tyler, and then we see Alaric and Damon try to get intel out of her at The Grill. But she's on to them, telling Damon she could smell his vampire-ness, along with the wolfsbane in her drink. Because it's a full moon, she tells Damon it's the wrong night to mess with her. He's been "marked."
What does this mean? We don't know. But Damon returns home and finds Rose, who says she needs a friend and will even help Damon protect Elena. She'll also have sex with him in the meantime. However, Rose soon gets attacked by a werewolf - and bitten.
Later in the episode, though, the wound appears to heal. Until she and Damon start to go at it, and it returns to her shoulder, seemingly bubbling and growing. This is how the episode ends.
- Tyler goes through the painful transition, but remains chained in his family's cellar. Caroline remains by him the entire time.
- Elijah comes to Elena and strikes a deal with her: he wants to kill Klaus. All Elena has to do is live her normal life, drawing Klaus out in the process. Elijah will be sure to protect her and her loved ones in exchange. He says he's a man of his word and appears to prove that by using Jonas to life the tomb curse... for Stefan only.
He's allowed to leave, but Katherine remains in the tomb. During her earlier interaction with Stefan, she had told him to look into Isobel if he wants to learn more about The Originals.
- Bonnie, meanwhile, asks Luca to help her break the moonstone curse. They work together and appear to actually explode this item, leaving Bonnie to believe the mission is accomplished. But Luca has deceived her. He goes home, tells his dad that Bonnie bought the entire "show" and gives Jonas the moonstone. Jonas tells his son there's one more thing he needs him to do, but it isn't revealed on the episode.
Source: TV Fanatic