Fulmer's rift with Rose leaves him open to manipulation from Coake, but his plans to exploit Fulmer are interrupted when Cameron takes a drastic step.

After a shocking death on board, the team are tested to their limits by a deadly blizzard that brings them into close contact with the Ancestor – and another danger even closer to home.

The Bravo team race against time to reach the Heart of the Ancestor before Pictor. But when they learn that Darian still has an ace to play, Rose and Fulmer have no choice but to give themselves over to a heroic act of self-sacrifice.