Part one: Ten unsolved murders in Derbyshire
From a high profile killing which led to the wrong man being convicted, to a brutal attack which led to the biggest manhunt the country had ever seen - the county's criminal past has been unveiled. A Freedom of Information request to Derbyshire Constabulary has revealed details of ten murders which have never been solved.
In part one, we take a closer look at three of the cases which have baffled detectives over the years.