It started on a small scale, seemingly without any pattern, at a yoga studio on Södermalm in Stockholm.
But soon a more large-scale shoe operation would make the owners turn a deaf ear.
The owner tells the newspaper Mitti how 15 right-wingers disappeared at one and the same time.
- It was clearly planned, you have to have a big bag.
We thought it was a joke, but we searched far and wide and never found the shoes, says Maija Ahola to the newspaper.
At first it was suspected that the shoe coup was aimed at the yoga studio, but after investigating the matter further, a clear pattern emerged on Södermalm.
A shoemaker's door ravages freely in the district - and he seems to prefer right-hand shoes.
More shoes gone
Forsgrénska baths at Medborgarplatsen and Eriksdalsbadet are also affected by mysterious thefts of right-hand shoes.
Christoffer Carlsson, criminologist and detective story writer, becomes fascinated by the case and suspects that the serial killer could suffer from some kind of obsessive-compulsive disorder.
- Very difficult to say.
It is hoped that they will get hold of the person who did it, so that you can get an answer.
If it now becomes such a meaningful answer, I myself am doubtful.
Have you heard of anything like this before?
- I know someone who stole eggs from egg cartons in grocery stores.
He did not take the cartons, that is, but picked eggs from them.
He said he did not want to "take more than necessary".
That's probably the closest thing.