I didn't see that particular episode but, previous to that, Louise did discover that Ray was the stalker. She had confided in Diane at the Woolpack that she had kept the stalker's mobile number after he had sent her messages. As she was about to return to Ray to leave the village, she dialled this mobile number and left a message to the effect that she was leaving. What she didn't see but we did (can you see a sound?!) was Ray's briefcase in the back of his car, and a mobile phone ringing. On their way out of the village in the car, Louise finds Ray's second mobile phone and comments there is a missed message on it. Ray tells her to leave it be, but she insists on listening and, of course, hears her own message. Being sensible, she tells Ray it's a message from Diane. However, it comes about that Louise tries to escape from the car and Ray, obviously, is trying to stop her. They end up crashing. Louise wakes up first and runs back to the village, but there's no one around - they are all up at the Tates' following a power cut. So she goes to her house and tries to ring Terry, with no luck. At that moment, Ray walks in. That's the last I saw!