How it began:
From The Guardian,
How it's going.
The Australian newspaper has more details (behind paywall) but apparently the money was transferred across in forty thousand transactions.
That's 2.3 Billion dollars. Serious money.
Sky News has a good segment on the subject.
From what I've read on the subject, it appears that the Vatican bank was a personal fiefdom of several corrupt cardinals and they were laundering money.
And I don't think Francis or the other Popes were aware of this.
That's a huge problem.