After her brother David is killed in a car accident, Darcy begins a journey to find the recipient of her brother's heart in the hopes of finding a piece of her brother still alive as well as her own peace of mind.
In the 1960s, superpowered humans Charles Xavier and Erik Lensherr work together to find others like them, but Erik's vengeful pursuit of an ambitious mutant who ruined his life causes a schism to divide them.