To activate her mother's memory, Esther returns to their old home and uncovers a shocking family secret. Niels receives an unexpected visitor.

As both Esther and Lucas struggle to come to terms with their new realities, Billie helps Ana through a crisis, and Martin begins to act erratically.

With the testers' lives hanging in the balance, Esther goes to extremes to revive Martin. Meanwhile, Paul and the company prepare for launch day.