Reopening the crime files of some of the most shocking crimes in UK history to explore unanswered questions and reveal the clues that ultimately cracked the case; along the way, eyewitnesses, survivors, and detectives share their stories.
When six children died in a house fire in Allenton, Derby in May 2012 it shocked the nation.
In the summer of 2006, 23-year-old Polish student, Angelika Kluk went missing from a church in Glasgow.
Over a four-month period in 2012, Manchester "hardman" Dale Cregan brutally murdered four innocent people.
John Sweeney murdered and dismembered the bodies of two ex-girlfriends before dumping them in canals in London and Rotterdam.
With exclusive access to Dennehy's mum and dad, hear from the murderer's parents and how the crimes of their daughter have shattered a family.
Steven Gerald James Wright is a serial killer, also known as the Suffolk Strangler and the Ipswich Ripper.
In the summer of 2011, there was panic and confusion at Stepping Hill Hospital in Stockport following a spate of hypoglycemic attacks.
Rumours of child sex abuse in Rochdale had been circulating for years in the early 2000s, but investigations weren`t followed up and nothing was done.