This is Death in Ice Valley, an original podcast series from the BBC World Service and N.K.

I am Marit Gragh from N.K. and along with my BBC colleague Neil McCarthy,

we're trying to get to the bottom of the case of the Easter woman.

Episode 6. Spy Catcher.

Our last stop was in Tanangir, a small fishing village in the south of Norway.

This was the place where a fisherman called Berton Errtt,

saw the Easter woman talking to a naval officer whilst the penguin missile tests were taking place.

That's right, he recognised her from the police drawings in the newspaper,

and then he responded to the request to the public to pass on any relevant information to the police.

He did that, but he wasn't prepared for what came after he informed the police.

His son, Svaderot, was with him as the family were boarding a train at Stavanger Railway Station.

They were on their way to London for their Christmas holidays in 1970.

Waiting for the train, his father was approached by two policemen.

Svaderot has never gone on the record with this story before.

We were all four, the family was gathered there and should go on the train.

And he left our group and went with his policemen for about 15-20 minutes,

obviously talking with him.

He didn't say much to us. He said it was some policemen,

and then we were wondering about this, the whole trip we were in London.

Did he say why they came to the train station? What would they want to speak with him?

My father was a man of few words when things should be kept secret, you know.

When we came back, I was informed that he had had this knife and this handgun that he received from them,

...