Hannah Foster was a bright, happy and good-hearted 17-year-old who was looking forward to pursuing a career as a doctor. But her promising life was cut short when she was raped and murdered by Maninder Pal Singh Kohli as she walked home after a night out in Southampton in 2003. Real Crime outlines the long and complex police investigation that followed, and that ended only last October when Kohli was jailed for a minimum of 24 years. After the murder he had fled to India, assumed a new identity and even bigamously married. He was tracked down after Hannah's parents went to India to make a series of emotional media appeals for information. Detectives are unstinting in their praise of Trevor and Hilary Foster, and of Hannah, who had the presence of mind, even during her extreme terror, to dial 999 on her mobile phone after her abduction, thus giving police vital clues.

• Mark Austin