Mike Fargo never expected to be meeting Texas Guinan on a hot August day in 1926. But when the real-life, irrepressible hostess at the 300 Club, one of New York City's swankiest speakeasies, asks for a detective to check on a missing girl, Fargo gets the call. The missing girl, Brandi Collier, is one of several young hostesses working at the club. Despite Texas's obvious concern, Fargo can't be sure if the girl has been kidnapped, killed, or perhaps just walked off into the sunset with one of the high rollers that frequent the club.
Fargo starts with the usual suspects – the jilted boyfriend, a kitchen worker with hand trouble, and an ex-husband, but he can't get a handle on the case. With no ransom demand and no real clues, he is at a dead end. Then he receives a phone call that changes the entire direction of the investigation. A mystery caller – with an apparent ax to grind with the resolute detective – informs Fargo that he has seven days to find him and his captive, Brandi Collier. If he fails, Brandi will die. He sends Fargo a photograph of a tied up Brandi, confirmed by Texas as the missing girl.
Thus begins the most tension filled week of Mike Fargo's life. Not only does he have to revisit some vengeful, murderous mugs who have threatened him in the past, but he also gets a minefield of clues from his caller, several of which also put his life in danger. With the days dwindling down and Texas Guinan pressing him to find Brandi, Fargo has to walk a fine line until a fortuitous clue and a stunning development brings the case to a dramatic end.
