Based on season Three of TVD...
Caroline throws Elena and Ellie a party at the Salvatore boarding house for their 18th. Klaus and Stefan learn Damon has been following them, so Stefan returns home and kills Damon's girlfriend, Andie, as a warning.
I...
Bonnie believes her recurring dreams about Klaus' coffins will tell her how he can be killed. The dreams also lead Bonnie to a reunion with her mother, Abby, whom Bonnie hasn't seen for 15 years. At Abby's remote farmhouse, Bonnie, Elena, and Ellie meet Jamie, the young man Abby took in years earlier. Bonnie's sudden appearance catches Abby off-guard, but she does her best to explain the past. Tyler turns to an unexpected ally in his quest to regain his free will. Damon is intrigued by Alaric's new friend, Dr. Fell, and Klaus continues his bitter negotiations with Stefan over control of the coffins containing his family members.
The next morning, Bonnie was in the woods and saw her family gravestones...
The first headstone read, "Sheila Bennett."
She saw another one behind it, "Amelia Bennett."
She carried on walking and saw the same locked coffin. She walked over to it slowly and placed her hand on it.
"I figured out how to open it. Can you?"
She slowly turned around to see Klaus standing behind her.
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He sped over to her, biting into her neck, and she screamed.
She panted loudly, knowing she was somewhere dark.
She pulled out her phone and tried ringing Ellie, but her phone had no service.
"Let me out! Please!" She shouted, banging against the lid.
"Oh, my God. Oh, my God." She said, realising she was inside the coffin.
She began chanting in Latin. She grunted, and she banged her hands against the lid again.
She then heard footsteps approaching.
She banged harder.
"Hey! I'm in here! I'm in here!" She shouted and screamed.
She saw someone she didn't know open the lid of the coffin.
Later, Bonnie, Ellie, and Elena stood in the basement with the coffins...
"I've been having these dreams for days now. It's like the witches are trying to send me a message." Bonnie says.
"I just can't believe you guys have kept this from me this whole time." Elena says.
"Yeah, well, we're telling you now. Stefan thought if you knew where the coffins were... Klaus could threaten people to get the information out of you." Ellie says, signing loudly.
"These are the rest of his family?" Elena asked, looking between them.
"Yeah." Ellie said, nodding slowly, staring at the coffins.
"Elijah and two others. This one is the one we can't open." Bonnie says.
"We don't know who's in it or what's in it. Stefan thinks maybe it's locked for a reason." Said Ellie.