Outside of their all being mysteries of one sort of another, what do these books have in common?
Blood on the Bannisters
Excuse My Gat! Gore by the Gallon
The Man with the Missing Toe
Severed Throats
Three Dead on Tuesday
The answer is below the fold.
None of these books is real. All of them are read or referred to by characters in the novels of P.G. Wodehouse.