In 1984 a parcel bomb was sent to a 53 year old grandmother living in a tranquil English village. She died of horrific injuries. No one understood why it had happened. The killer hadn't been near the crime scene, nor even met the victim. The only evidence detectives had was the bomb itself; it was the only link to the killer, but it had been blasted into thousands of pieces. Investigators faced the momentous task of piecing the tiny fragments of bomb back together in the hope that it might give them a shard of critical evidence.In this episode, we will meet the officers who doggedly fought to bring a bomb-making madman to justice by assembling the evidence into a coherent narrative. We also get moving insight from a family member of the victim who visited the scene shortly after the explosion. And we reveal why it took 18 years to bring the suspect to court.