On August 1, 2015, at the foot of one of the most luxurious towers in Tokyo where all the Japanese press is gathering, Mark Karpelès comes out of his home under police escort. The face hidden under a cap, he wears a carefully chosen t-shirt: "Effortless French”. A few hours later, the French developer is indicted and imprisoned for forgery of computer data and embezzlement in connection with the investigation into the disappearance in February 2014 of 850'000 Bitcoins, the equivalent of a half Million Dollars. The young man then ran MTGox, the company responsible for this financial disaster and the biggest platform for virtual currency exchange, managing 80% of global transactions. For one year, he remains in pre-trial detention until the Japanese justice decides to release him, for lack of evidence. Mark is finally free to prove his innocence.