Kate, Rose, Rachel, and Claire are four New York girls who cannot recall what events transpired the previous night. While at school news spread to the student board that the NYPD found Lize's body left at Central Park. Kate, who was close friends with Lise, breaks down and takes the rest of the day off. As the night falls, she and the other three girls are led by butterflys that only they can see to the same place and are unexpectedly approached by a woman wearing a black suit. She asks them if they can remember the previous night when all of them died.

It is Christmas Eve, and each of the girls spend the night in company of their loved ones. As the sun rises in the morning, all four bid their last farewell and gather at the school to prepare for the upcoming battle.

The bridges connecting Roosevelt Island are destroyed by a set of explosions to cut all accesses to the mainland. War erupts among the Animus and Dolore, as casualties arise from both sides. Hervé, with Anna in his arms, breaks into the school grounds. The four girls follow in pursuit and find Lise at the school.