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How would it feel to have your deepest secrets held to ransom?

You have different tragedies in your life that you wouldn't write into your own journal.

This is the story of an unprecedented crime.

The biggest case in Finnish criminal history.

Thousands of victims exposed by a huge data hack and the hunt to track down a criminal

who was thought to be untouchable.

Makes me sick to my stomach.

Intrigue, Ransom Man.

Listen first on BBC Sounds.

We're heading back to 1954 for today's case and I'm starting things off in an office building

at 258 Houston Road, right next to Warren Street Station in the most central of London.

The office belongs to a large chemical manufacturing company called Sangers Limited.

They supplied drugs to pharmacies up and down the country.

On any given day you'll find men in grey suits wandering around, checking everything is ticking over.

And with this being the 1950s and all, there's also a huge number of typists.

Typically, these are young women who spend their days tapping out letters, bills of sale and other documents.

The Sanger's Limited Office is usually a pretty mundane place.

Nothing out of the ordinary happens here.

But on the afternoon of Wednesday, April 27th, the atmosphere is extremely tense. Something terrible has

happened. What began as a totally normal day has descended into a nightmare. At 3.30pm, a typist

called June Maylands had begun complaining of stomach pains. She was taken to the on-site nurse.

...