Struggling single mother Nora takes a grueling night-shift cleaning position at the prestigious Lockwood headquarters, desperate to secure an elite primary school enrollment for her six-year-old son, Toby. Instead of honest pay, Nora encounters vicious humiliation from her supervisor Vanessa, who treats the impoverished cleaner like disposable trash and sabotages her at every turn.
Cruelty turns deadly when Vanessa traps Toby in a locked industrial storehouse during a sudden fire. Nora braves the flames to rescue her son, catching the attention of the reclusive billionaire chief executive, Sean. Neither Sean nor Vanessa realizes that six years ago, an unforgettable night bonded Nora to the very tycoon now investigating the arson.
