For almost five years, documentary filmmaker Åsa Blanck has followed this around the Royal Mint Cabinet - a museum of money and financial history as well as medal art. Already in 2017, a former chief was sentenced to prison for theft, a review of the collections showed that there was no object for 25 million.

- One late evening 2015 I received a letter. A short story about something big going on at the Royal Coin Cabinet. Everything was secret, but it testified to an epic story. The letter ended with "I've said too much already". So it started for me. And everything I had a hint of in the beginning just grew and grew, says Åsa Blanck.

Theft, betrayal and secrets

At the end of January, a lawsuit will begin against another former employee who is charged with serious theft. The former employee is suspected of having sold further coins and banknotes for a value of four million. The corner of the Royal Coin Cabinet contains both theft, fraud and secrets.

- On the one hand, it is one of the biggest crimes against our national taxes. But for me it is also a story of a world I did not know existed: older men, many medals, arranges. It's a pretty closed world, almost like a secret brotherhood. But that's where we got into.

"Stories that have disappeared"

During his work on the film, Åsa Blanck has followed what the police have called the largest criminal investigation in the history of Swedish cultural heritage. But also staff at the Coin Cabinet, who have seen former workmates, are brought to justice for theft and receiving. The coins and banknotes that have now disappeared will probably never come back.

- Above all, there are stories that have disappeared, for every coin carries a story from our history that is now forever gone, says Åsa Blanck.

- What is it about people who risk everything - trust, high positions in society - and cross the border, for a coin?

The documentary series Guldfeber will premiere at SVT in April. The man who is accused in the January 2020 trial denies the crime.