One year before the accident, Rob realizes he is falling out of love with Jo after a series of insurmountable financial problems find him in need of emotional support she is unable to provide.
After a nasty fall, Jo develops amnesia and forgets the events of the past year. She returns home with her seemingly loving husband Rob but a missing phone and a series of lies reveal that not everything is as it seems.
Jo begins having flashbacks of an affair with her pregnant daughter's boyfriend but as the line between fantasy and reality increasingly blurs can she be sure it was her who was having an affair?
Jo remembers that she was not alone the night she was injured. She also starts suspecting she was having an affair and wonders if Rob knew. Childhood memories begin re-emerging as she grows more suspicious of Rob.
Plagued by nightmares, Jo visits a support group which doesn't go well. Her son comes to visit and a conflict Jo had forgotten is revealed. Meanwhile, Jo begins seeing a mysterious woman all over town.
After a talk with her dementia-suffering father, Jo pieces together her memories and gathers her family in the living room. During a harrowing confrontation, the truth behind her fall is revealed.