Promised total transformation, nine very different people arrive at Tranquillum House, a secluded retreat run by the mysterious wellness guru Masha.

As healing begins, the guests begin to doubt the retreat's unconventional methods. They came for massages and relaxation, not to face their own mortality.

As the guests learn more about Tranquillum's unique protocols, everyone must decide if they will continue under Masha's care. Meanwhile, Masha is receiving mysterious threats of her own.

Zoe's birthday celebration reopens old wounds, even as the group begins to grow closer.

Pressure on Masha intensifies, as she juggles the competing needs of her guests, discord amongst her staff and her absolute commitment to healing the Marconi family.

It’s time for everyone to cross the threshold and face their demons, including Masha. But will they make it to other side?