Zara's lived with migraines her whole life. After her sister, Sammy, passes away in a house fire, Zara's back on her own, and finds herself moving into a shoddy, run-down apartment with paper-thin walls. From the minute she gets there, her migraines get worse - and she doesn't know if it's the trauma, the stress, or something else entirely.
After a particularly bad migraine, she receives a note under her door - an offer of help from the stranger in Apartment 12B... but there's no such thing as an easy fix.