A famous thief in his younger years, widower Brian Reader, 77 years of age, pulls together a band of misfit criminals to plot an unprecedented burglary at the Hatton Garden Safe Deposit. The thieves, all in their 60s and 70s except for one, employ their old-school thieving skills to plan the heist over the Easter holiday weekend.

Posing as servicemen, they enter the deposit, neutralise the alarms, and proceed to drill a hole into the wall of the safe. Two days later, they manage to escape worth allegedly over £200 million worth of stolen jewels and money. When police are called to the scene and investigation starts, the cracks between the misfit gang members begin to show as they row over how to share the goods and become increasingly distrustful of each other. Meanwhile, the crime has become public knowledge, and a frenzy of speculations begin.