Sadie and Katrina's 'Memory Search'

Sadie hartley, apparently she believes this because she found a note she had written to herself. She felt that that note was telling her that sarah had done it. The police waste no time and head to the farm where katrina has directed them. Meanwhile, the investigation team have more c c t v evidence. They now have footage of sarah leaving her house on the evening sadie was murdered,. directly contradicting her story that she had been at home in bed ill all night. And they find an old knockeophone hidden under sarah's bed at her hous. But with all this evidence now mounting, it is, however, mostly circumstantial.