In the penultimate episode, the truth about Billy Pettigrew is revealed. In the lab, Natalie and Vincent probe the cause of the disturbing events in Fortitude.
Piano Concerto No. 3 in C Minor, Op. 37: I. Allegro con brio — Barry Wordsworth & Capella Istropolitana & Stefan Vladar
Henry listens to classical music on his cassette player as he lies in the snow on the mountain top.
At the Blue Hound Vincent confesses to Natalie that he didn't come there to see and do the things he's had to do but to work on his Ph.D. then she tells him what she's found and asks him to come back.