When Rebekah finds herself locked up in the sanatorium where she worked in 1919, she realizes a witch named Genevieve is back to seek revenge and to reveal dark secrets that would destroy Rebekah if exposed. A distraught Elijah turns to Marcel and Hayley for help when one of his decisions puts Klaus and Rebekah's lives in danger. With time working against them, Marcel realizes he may hold valuable information that could lead them to Rebekah and Klaus, but revealing it will almost certainly result in deadly consequences.