While most people spent the Easter 2015 weekend hunting for chocolate eggs, one gang of men had something much more valuable in mind: namely £200m worth of diamonds.

The absence of a forced entry and the mature ages of the men charged are only the first pieces in what has proven to be one of the greatest mysteries of the year. Just how did the 70-year-olds do it? Word has it that the gang of pensioners stealthily abseiled down a lift shaft and disabled the security system before drilling through 20inches of reinforced concrete wall to reach the vault – all without one noise complaint.

With characters initially dubbed as Mr Ginger, the Gent, Mr Strong, Mr Montana, the Old Man, the Tall Man and the Moped Man, this is a real life Reservoir Dogs that went right.

Written by Gordon Bowers, one of Britain’s best-selling true crime authors, this brilliantly researched book digs deep into this most bizarre of robberies, discussing the facts we know and the ones we can only speculate on. Its sheer impossibility may even prompt you to question whether what you’re reading is actually a fictional thriller after all.