In 2016, eight-year-old Daisy Mason vanished from her Oxford home.
Her disappearance made the national press and the final culprit shocked everyone.
DCI Adam Fawley remembers the case well, he arrested Daisy's mother for murder himself.
But her body was never found.
Now, forensic evidence at a current murder scene calls the whole case into question.
DCI Adam Fawley and the team are brought back in to investigate. And they all have one question on their minds.
What really happened to Daisy Mason?
