Glitches (The Lunar Chronicles, #0.5)

Note: this short story is also available in "Stars Above".

Cinder, a gifted mechanic, is a cyborg. She’s a second-class citizen with a mysterious past, reviled by her stepmother and blamed for her stepsister’s illness. In Glitches, a short prequel story to Cinder, we see the results of that illness play out, and the emotional toll that takes on Cinder. Something that may, or may not, be a glitch…