It's called "Last Call Chicago: A History of 1001 LGBT-Friendly Taverns, Haunts & Hangouts."
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It's by Rick Karlin and St. Sukie de la Croix.
The book goes back through the history of the bars, from Speakeasies of the 1920s to today's hot spots.
The book goes on sale this week.
There's a meet and greet with the authors at 6 p.m. on Oct. 12 at Sidetrack, located at 3349 North Halsted Street. You can learn more about the event here.