1) Amanda is experiencing strange occurrences like finding masked men watching her house and receiving mysterious phone calls with no one on the line, leaving her feeling stressed and paranoid.
2) On her way to work one morning, Amanda sees the same masked man again and thinks she sees him a third time, greatly increasing her fear and panic.
3) Amanda arrives home driving recklessly due to her stressed state and mistakenly yells at the occupant of a car she believes is following her, though the car is empty. Overcome by paranoia, she barricades herself in her home.