On 27 June, 2021, holidaymakers stumble across headless human remains. Having identified the victim as 67-year-old Deborah Chong from North West London, investigators rush to learn how her body came to be so far from home.

With Jemma Mitchell under arrest, police have a circumstantial case against their chief suspect in the case of Deborah Chong’s murder. But when searches come up short, the lack of forensic evidence throws investigators’ working theory into question