Memory of a Murder

Bailey Collins regained consciousness in the passenger seat of her wrecked car. Her first concern was for her husband, but it was a stranger with a bullet hole in his head behind the wheel. A gun lay between them.
Who was this man? Where were they and how did they get there? Did she kill the stranger? If so, why? Bailey couldn't remember. She knew her name, where she lived, so why couldn't she answer any of these questions?