The Best Episodes Written By John Henry Butterworth

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

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.

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.

Martian finds a needle in a haystack and confronts Sami about London.

Henry and Martian run diplomatic interference. Danny walks a tightrope.

A spooked source threatens to put an operation at risk.

Henry sends Owen to Minsk in a hunt for clues. Martian sets a rat trap.

Martian's approach doesn't go to plan. Sami makes a startling confession.

Covert CIA agent Martian is called back to London Station.

Martian buys time with a bluff to Langley. Danny crosses the Rubicon.

Martian scrambles to unravel Cossack's game. Osman plays his hand.

Bosko is briefed on Valhalla. Martian, Henry and Naomi strategize a play.

Bosko shares a grim truth. Martian makes a devil's bargain.