A young mother, whose children were bludgeoned to death in their sleep; two old people beaten to death for their cashbox; and a Satanic serial killer’s reign of terror.

All crimes solved by a single fingerprint. From fiction to the very latest technology, we’ve come to take fingerprints for granted. But it wasn’t always like that. It took many years to convince the police and the public that a single, simple fingerprint could catch a criminal.