The following books are bestsellers, but only amongst the groups mentioned.
Bestseller amongst geese:
How To Keep Your Down When Everything Is Going Up
by Harry Honk
Amongst viruses:
Fifty Shades of Ebola
by Diane Diagnose
Amongst Ku Klux Klan members:
A Brief History of White
by Ray Cyst
Amongst brides:
How To Be A Virgin When You Ain't
by Ida Impure
Amongst trains:
The Tracks of My Tears
by Loco Motif
Amongst ghosts:
Crime and Ectoplasm
by Fyodor Ghostoyevsky
Amongst suicide bombers:
The Big Bang Theory
by G. Powder
Amongst endings:
Is It Really The End?
by Al L. Finn