A bar is process by Mike Callahan. A regulars come welcoming & uncoerced to listen to any visitant's problems, regardless how else unknown, however don't snoop in case the visitant is unwilling to part. Unknown & unusual cases & visitant turn higher using frequency in the stories. Regulars at Callahan's include the talking puppy, many alien & period-travelers, the lamia, a few Irish mythologic beings, & an obscenity-spewing parrot. A stories produce heavily utilise of paronomasia.

Lady Sally McGee, the madam of a home of first-class reputation (& Mike Callahan's married woman), stars around Robinson's "Callahan's Lady" & "Lady Slings The Booze." A regulars at Lady Sally's bordello (in which a employees come "artists" & a patrons come "clients") insist on the equivalent empathy & humor when people at Callahan's, & it is even as in all likelihood to use wow backgrounds.

Lady Sally's family name is near for certain the tribute to the fictional character Travis McGee who appeared in the total of novels by John D. MacDonald.

This is the source of Callahan's Law (likewise referred to as a Law of Conservation of Painful sensation & Joy): "Shared pain is lessened; shared joy, increased — thus do we refute entropy." Declared an additional way: "Just as there are Laws of Conservation of Matter and Energy, so there are in fact Laws of Conservation of Pain and Joy. Neither can ever be created or destroyed. But one can be converted into the other."

the series has a related Usenet newsgroup, alt.callahans, and IRC channel, #callahans, for fans.