The War of the Worlds
H. G. Wells's Martian invasion of suburban Surrey.
202 cryptograms drawn from it, every one by H. G. Wells.
How hard they are
50 easy, 94 medium and 58 hard, graded by the model described in our guide to solving cryptograms.
They average 72.2 letters over 19.2 distinct ones, with 4.1 letters appearing exactly once.