This man and a few companions
Escaped from jail,
Or rather, a prison camp in Siberia.
One of the fellows was called Slav.
...
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The name of this mystery person is Slavomir Rawicz. The title of his book is The Long Walk - The true story of a trek to freedom.
Yes, I know this mystery person. I have the book he wrote. Very remarkable achievement! An almost unbelievable feat. I won't spoil it for others by saying his name here.
This is actually an acrostic poem. If you read the LAST letter of every line you will see the person's name.