In 1992 on a council estate in Sunderland a seven year old girl is murdered. It took the police 30 years to find the killer, a convicted child sex offender who lived three doors away from where Nikki Allan went missing. What happened on the night of her disappearance? For the premium Tortoise listening experience, curated by our journalists, download the free Tortoise audio app.  For early and ad-free access to all our podcasts, subscribe to Tortoise+ on Apple Podcasts. If you’d like to further support slow journalism and help us build a different kind of newsroom, do consider donating to Tortoise at tortoisemedia.com/support-us. Your contributions allow us to investigate, campaign and explore, and to build a newsroom that is responsible and sustainable. Hosted on Acast. See acast.com/privacy for more information.