Where is their mother's grimoire? Elijah and Klaus argue over it in this clip from The Originals.
Added:
The focus is on Kieran this week. Check out The Originals promo for "An Unblinking Death" now.
Added:

The Originals Season 1 Episode 19 Quotes

I wouldn't stand that close to him if I were you. He's kind of unpredictable. And murdery.

Josh

Klaus: Think very carefully before you speak. The sound of your voice is likely to make me regret what mercy I've shown thus far.
Marcel: Yeah, yeah, I'm on your "who's been naughty list."