Michael sacrifices everything for a possible future with Elsa. As his violent deeds catch up with him, Dan realises he will never leave Fortitude.
Michael hunts for the place he was held captive, and makes a shocking discovery. Annie Burgess arrives in Fortitude looking for answers.
A survivor of the deadly parasite makes a connection with Michael, but things take a violent turn. Meanwhile, Dan continues to lose his grip on reality.
Oslo send two new officers to attempt to make some sense of the anarchy in Fortitude, and Dan Anderssen continues his descent into madness, bringing him face to face with a grief-stricken Michael Lennox.