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Last night my sister was murdered. The police think I killed her.

I was there. I watched the knife go in. I saw the man who did it.

And heard him laugh when he said he'd never be caught.

Because he knows I have prosopagnosia - I can't recognise faces.

And if I don't find the man who killed my sister, I'll be found guilty of murder.

(p) Orion Publishing Group 2019