Laura Mauro's contribution to the Impostor Syndrome anthology draws on Irish folklore and modern medical science to produce a remarkable story. Is it a coming-of-age tale? Not exactly, though it concerns pre-teen twins at a time of great change in their lives.
At twelve confident Hazel is developing faster than quiet, uncertain Tara. Despite this new distance between them the twins still share a secret life, heading out after school for the lough near their home, where they set traps for faeries. Not that they believe in faeries, not really. They're no longer little kids. But their custom is belief of a kind, and becomes crucial when Tara collapses and is diagnosed with leukaemia.
The mysteries and terrors of childhood illness are perfectly described, here, with an added weird touch. Hazel becomes convinced that Tara is not, in fact, her sister at all, but a changeling. She is of course trying to rationalise away the unbearable truth that her sister is dying. Or is she? No spoilers here. I'll just say that the story is excellent, and could not have been more artfully completed.
More impostors (real or imagined) in due course.