The anthology, a Sackful of Shorts, has no theme in the usually accepted sense. What holds it together as an anthology is the history of its group of authors. Most but not all the stories are published here for the second, third or fourth time, having originally been published or broadcast elsewhere. Many of them are prize-winners. The author bios at the end of each story provide more information about the writers and give links to their other work.
The plan was to offer this collection as a free e-book, but that would have prevented it being available in some key outlets, so it is offered at a minimal price of 99 cents. And half the book can be downloaded for free.
And now this blog becomes a bit of a cheat because author and reviewer, Stuart Aken, has written it up on his blog so I direct you to his excellent piece for more detail.
The anthology can be found, downloaded or bought on Smashwords.