Mallory Moe is a twenty-five-year-old veteran Army mechanic, living with her girlfriend, Andrea, and working overnights at a gas station store while figuring out what's next. Andrea's off-grid cabin provides a perfect sanctuary for Mallory, a synesthete with a hypersensitivity to sound that can trigger flashbacks from her childhood. The getaway that's largely abandoned during the off season starts out idyllic, until Andrea's once-loving behaviour turns controlling and abusive, and Mallory once again finds herself not wanting to go home. After a particularly disturbing altercation, Mallory escapes into the subzero night and stumbles into Shay, a teenage girl, injured and asking for help. But it isn't long before she realizes that Shay isn't the only one who needs saving.