On a Monday afternoon in an affluent Birmingham suburb, a husband rings 999 to say he has killed his wife. The man is covered in blood when he is arrested outside his home but when he is brought to police custody and interviewed, he initially claims not to remember anything. Both houses are sealed off and it’s the job of crime scene coordinator Jo Ward to lead the search for forensic clues that could prove or disprove the suspect’s account. Forensic scientist Phil Field goes to the scene to carry out Blood Pattern Analysis to help map out the sequence of events surrounding the attacks. The investigation takes a significant turn when digital forensics experts manage to crack the suspect’s mobile and an insight into his motive is revealed.