A woman lies dead in a Nottingham flat, her terrified sister barricaded in the bathroom. At 2am a young man in a bloodstained shirt is pulled over for speeding. The three only met that afternoon – what happened in those fatal hours? All there is to go on is what the two survivors say.

• BBC
• Karla Crome
• Joe Dempsie
• Robert Pugh
• Stephen Dillane
• Claire Rushbrook
• Lauren Socha
• Lara Rossi
• Kate Donnelly