What’s real, what isn’t — and does it matter? The truth comes out, the fear grows and the mystery threatens to sweep away everything before it.

Emerging from the shadows, a surprise visitor gets Gríma’s full attention. As the ground beneath them shifts, Darri and Gunhild heed Katla’s call.

A shocking revelation that would ordinarily offer closure instead opens up a chasm of questions. History repeats itself as a deadly ash storm gathers.

Face to face with an utter mystery, Gríma tries to understand her shadowy find. Rakel has a change of heart as Gísli deals with an unexpected arrival.

Sometimes shadows have minds of their own. At the scene of the accident, Rakel pours her heart out to Gríma. Darri canvases the crevasse for answers.