Forty-six-year-old Stephen Wallace is found dead in his Paisley home from a number of injuries. The detectives forensically comb the crime scene for clues which will lead them to his killer.

This episode sees the Police Unit's number one suspect in the disappearance of Julie Reilly, under interrogation.

His interview leads to frustration for Julie's family and the detectives. They need to gather more evidence to convict him, but with no body it takes all their skill to prove guilt and charge their suspect.

This episode investigates the disappearance of Julie Reilly, a 47-year-old mother of one who was reported missing in March 2018. After an extensive four-week-long search fails to find her, the skilled investigators of Police Scotland's major investigations team take up the case. A set of suspicious circumstances and a horrific forensic discovery lead them to a suspect. The detectives now need to find Julie's body and gather enough evidence to charge and ultimately convict him.