In 1871, a Chicago undercover detective gets a job as a porter in a disreputable saloon to get information on a stolen painting, which he believes will be fenced there by thieves. He soon falls in love with the saloon owner's daughter, who believes him to be just a porter. Soon his undercover work puts him and the girl in danger, from both the criminals who stole the painting and the infamous Chicago Fire of 1871.

"The O'Leary's and their famous cow, "The Halstead Street Terror," "Peg-Leg" Sullivan and other fascinating characters."