On March 9, 2016, employees of Mossack Fonseca, a Panamanian law firm that for decades had kept the financial secrets of global celebrities, oligarchs and criminals, made a stomach-churning discovery. Someone had copied huge amounts of data from its computers.
Emails, contracts, banking statements – 11.5 million documents of the firm’s most sensitive client records, a staggering 2.6 terabytes of data – had been taken.