Umbernight
Novella 18,059 words Recommended by 11 award/anthology sources
The colonists on Dust usually hunker down for their years-long winter, especially when the companion star, Umber, blasts the surface with radiation, but a critical package from Earth needs to be retrieved now.
Content warnings 4
body-horrordeathdeath-of-a-loved-oneviolence
Quasar links out; the story lives on Clarkesworld, where the author gets the click.