A former case ends up becoming relevant as Pritchard and Duval take a look into some murders involving young prodigies.

Gracie's life is in danger unless Pritchard and Duval can reach her in time and rescue her from Connor and Otto's experiment. Meanwhile, Mary and Alexa search for a way to save Pritchard since he can no longer regenerate in the tank; and Otto struggles to come to grips with his decisions that have touched so many lives.