Return of the programme following investigations into serious crimes. When 12-year-old Leo Ross is fatally stabbed in Birmingham's Trittiford Mill Park on his way home from school, police suspect a 14-year-old, but need forensics to prove he is the killer. There is little information about whether Leo was targeted, and finding a murder weapon in such a vast area is an immediate challenge. The park has numerous pathways, an area of marshland, and no CCTV coverage., but bodycam footage from first responders proves to be crucial