Unable to cope with his son's death, Klaus turns off his humanity. Elijah and Rebekah try to make him turn it back on but face failure after failure. Fearing he's lost to them, they decide to enlist Caroline's help in a last desperate attempt. Their plan is put in jeopardy when a surprise awaits Elijah in Mystic Falls.

The Mikaelson family had a saying. "Love beyond family is the greatest weakness. We do not feel and we do not care." It was a code he lived by. So why did he save the girl? Klaus / Caroline.

The girls come up with a plan to send Caroline back in time to kill Klaus before he ever arrives in Mystic Falls. But it turns out their plan won't be as simple as they thought. Especially when Caroline gets stuck in the past & only has Klaus to rely on.

Elijah has a plan to send Caroline back in time to change Klaus' fate. His plan did not include Kol trying to seduce her as well as as his own past self trying to get rid of her. Will the original family embrace her or end her life before Klaus learns what she means to him. Klaroline.