Hands up if you think Klaus (Joseph Morgan) is going to be pissed when he finds out that Rebekah (Claire Holt) and Marcel (Charles Michael Davis) were behind Mikael’s appearance in New Orleans all those years ago? Us, too. But, interestingly enough, the synopsis for The Originals Season 1, Episode 16 (“Farewell to Storyville”) suggests that there’s a family secret that could trump Klaus’ rage. What could it possibly be?

The synopsis for the upcoming episode reveals: “Despite Klaus’ rage, Elijah (Daniel Gillies) is determined to protect Rebekah while the three of them are trapped in the City of the Dead cemetery by a witch’s boundary spell. Klaus and Rebekah trade bitter accusations until Elijah steps in to reveal a long-held secret from the family’s past.”

So, not only is Rebekah and Marcel’s secret out in the open by Episode 16, but Elijah has a better one. We have to admit, we’re scrambling to figure out what it could be. Might Elijah himself have played a part in bringing Mikael to New Orleans? It sounds like the secret is much older than the early 20 century, but that covers a lot of time and many different situations.

Our front running speculation is that Mikael and Esther had some sort of tracking spell put on the Mikaelson children to ensure that they would always be able to find one another. This would be an interesting development because, while it would not necessarily forgive Rebekah’s intentions to bring Mikael to NOLA, it would imply that he wasn’t the reason he eventually showed up. Does that count for something? Maybe. It would also represent a major betrayal on Elijah’s part if he never told his siblings about something of this magnitude.

Another possibility is that the secret has something to do with the werewolves and, more specifically, Klaus’ werewolf family. We know very little about what happened to them, and we think there’s much more to the story. Given that there are descendants of that same clan living in New Orleans, we wouldn’t be surprised if the topic came up.

Whatever the secret, the fact that Elijah seemingly kept it for all these years is big, and we’re excited to see how that plays out. Elijah is generally the honorable one. The loyal one. But he also has a major protective streak that would make it possible for him to withhold major information from his siblings for centuries if he thought it was for the best. Drama!

What do you think the Mikaelson family secret is? Share your theories in the comments below!

The Originals airs Tuesday nights at 8 p.m. ET on The CW.

Kayti Burt is a contributing writer for Wetpaint Entertainment with a penchant for all things pop culture. Follow her on Twitter and Google+!