'What's Yours Is Mine'

Holly Ice's contribution to Impostor Syndrome is, in some respects, the most straightforward story so far. Sophie visits her mother who is suffering from early onset dementia. A friend of the family reveals a secret that's been  kept from Sophie since early childhood - she has an older sister, Isabelle. The scar on Sophie's arm was not from a cycling accident. Isabelle is confined to a hospital and her mother has been visiting her regularly for decades.

Understandably staggered by this revelation Sophie decides to go and meet Isabelle, only to encounter a woman who looks uncannily like her. Things then take a nightmarish twist, one that is arguably a little too predictable. However, the story's ending has a genuine modern Gothic feel, as Sophie discovers just how dangerous Isabelle is.

'What's Yours Is Mine' is a well-written tale of existential horror, suggesting - quite rightly - that even the most ordinary-seeming family can harbour strange secrets.