gives viewers a never-before-seen look into the real-life criminal investigations of the UK's most talented and successful sleuths who tackle some of the UK's most challenging criminal cases. With access to top police officers from across the country, the gritty and intelligent new series will meet the most hardened of criminals in impossibly tough cases, where regular police work has hit a brick wall, and tell the stories of the super-specialist, elite teams who are assembled to make a breakthrough.