Nothing, on earth or below it, in the skies or under the seas, freezes faster than the worthless heart.

Before she was a hideous monster, the Queen of the Underworld was simply Hel. But cast as a young girl from lofty Asgard, the realm of the gods, by Odin the Allfather, Hel's fate as the terrible goddess of death is sealed. Half beauty, half crone, she has reigned for centuries over the starless darkness of Niflheim, welcoming the most pitiful amongst death's travellers to her icy prison. Until, one day, a memory shifts, and she is forced to seek out the sun in Midgard, where humans have made their home.

Faced with a terminal cancer diagnosis, Helen Firth makes the impulsive decision to return to Orkney after forty years to make peace with her past and ultimately die. Under the wintering solstice sun, she reconnects with the ungainly but affable Thorfinn Coffin, who helps her address the real reason she has chosen to return to the island.

As Helen nears ever closer to death, and ever closer to Thorfinn, Hel in turn finds herself drawn to Helen. She, too, has a past to confront and a lesson to learn - that perhaps who she thinks she is isn't who she's really meant to be...