I had never heard of it, but have enjoyed a few of Verne's books (most notably The Mysterious Island recommended by son Matthew) so I randomly picked this one from LibriVox.
Turns out, according to Wikipedia, "Critics consider it one of Verne's best books."
The full title is Michael Strogoff, The Courier of the Czar.
I am almost 1/2 way through, and it is very good so far.
Oremus pro invicem!