The entire Mikaelson family is in grave danger in the next episode of "The Originals" season 3 titled "Dead Angels."

There is a weapon that can slaughter the clan easily and someone who should not have it successfully got her hands on it.

The teaser for the installment teases that Cami stole the weapon. It remains to be seen what her intention is in taking it, but her face when she was called out for pilfering "the one thing the most powerful vampire family in the world" made it look like she has a plan.

What makes this "The Originals" season 3 episode interesting is that Klaus will be the one chasing Camir down. It will be interesting to see the lovers become enemies. Klaus will not only be making a big decision here, he will also be in serious danger by confronting someone with the killer weapon.

Meanwhile, Elijah decides to "take back what is mine" from the Strix. However, Aya won't make it easy for him.

"I challenge you to a duel," the ancient vampire tells Elijah, who smirked upon hearing the proposition.

Aya is also after the weapon, and it looks like she has found a way to get it. In the teaser for the upcoming "The Originals" season 3 episode, Aya threatens Davina that she "will not rest until that weapon is found." The Strix leader strokes Davina's hair while saying her plan, and Davina could not help but flinch as she appears to suppress the urge to fight back.

Speaking of Davina, the episode teases that a new coven will approach her.

Meanwhile, new details about the show's crossover with its parent series "The Vampire Diaries," which will take place late this month, have sufraced. Stefan may be saving someone when he finds his way to New Orleans.

"The Originals" season 3, episode 12, "Dead Angels" airs Feb. 12 at 9 p.m. ET on The CW.