Michael Perkins, an awkward 13-year-old, is dealing with a lot. After his father's sudden death, his mother married the awful Glen. His two younger siblings drive him crazy, yet he's had to become a de facto parent as his mother works double-shifts to keep the family afloat. Then one day, Michael wakes up and his mother is gone. She's been replaced by an exact duplicate mother, the 'other mother'. No one else seems to notice the impostor but Michael knows that this mother is not his.