If you can't trust yourself, who can you trust?

Cass is having a hard time since the night she saw the car in the woods. It was on the winding rural road, in the middle of a downpour, and a woman was sitting inside--the woman who was killed. She's been trying to put the crime out of her mind; what could she have done, really? It's a dangerous road to be on in the middle of a storm, and she probably would have been hurt herself if she'd stopped. Not only that, her husband would be furious if he knew she'd broken her promise not to take that shortcut home.

But since then, she's been forgetting every little thing. Where she left the car; if she took her pills; even the alarm code.

The only thing she can't forget is that woman, the woman she might have saved, and the terrible nagging guilt.

And the silent calls she's receiving, or the feeling that someone's watching her...