Sixes and Sevens

O. Henry was the pen name of American writer William Sydney Porter whose clever use of twist endings in his stories popularized the term "O. Henry Ending."
 
In compilation only.
 
1) The Last of the Troubadours
2) The Sleuths
3) Witches' Loaves
4) The Pride of the Cities
5) Holding Up a Train
6) Ulysses and the Dogman
7) The Champion of the Weather
8) Makes the Whole World Kin
9) At Arms with Morpheus
10) A Ghost of a Chance
11) Jimmy Hayes and Muriel
12) The Door of Unrest
13) The Duplicity of Hargraves
14) Let Me Feel Your Pulse
15) October and June
16) The Church with an Over-Shot-Wheel
17) New York by Camp Fire Light
18) The Adventures of Shamrock Jolnes
19) The Lady Higher Up
20) The Great Coney
21) Law and Order
22) Transformation of Martin Burney
23) The Caliph and the Cad
24) The Diamond at Kali
25) The Day we Celebrate