Big Little Crimes tells the remarkable stories of ordinary beat coppers who stumble upon a key piece of evidence — a haul of stolen goods, a suspect on the run — and bring a major criminal to justice. A copper's instinct leads to two armed robbers being caught committing a daring cash-van robbery. Some dangerous driving leads to investigators uncovering a massive drug operation, and a suspicious transaction is the clue to cracking a conspiracy of fraud across the length of Britain.