The Arsonist

S3, E5: Kurt Wallander has now been diagnosed with Alzheimer's. It's like a bullet in the head. He wants to hide it from his friends and relatives. Tommy is released from prison after he has served time for arson. As the whole town of Ystad hates Tommy, he goes to live with his sister and her husband. Immediately, Ystad, is burning again and all the evidence points to Tommy. Something Wallander doesn't believe. The inspector suffers more and more from his disease, which leads to even more problems for Tommy, the one he's trying to help. Is Tommy guilty or is it the whole village? Finally, Wallander tells his daughter Linda about his disease. She promises him to be there for him until the end.