In the Arctic Sun by Rowan Hill
After a painful separation, Sarah is alone in her arctic home when she starts hearing and seeing strange things around her home. Scratches on the roof, doors that won't stay closed and a mysterious presence in her basement are her new companions.
Sarah is isolated by more than just her location. As the situation in her home grows more dire, she turns to the men around her, but they in turn doubt and distrust her. In turn, Sarah grows more desperate until she is forced to take matters into her own hands.
This novella is tense and gripping. The story builds into a violent climax and an ending I did not predict.