As co-owner of the Rabbit Hole, a quirky-cool Minneapolis coffee shop, Shay O'Hanlon finds life highly caffeinated but far from dangerous. That is, until her lifelong friend Coop becomes a murder suspect. The victim was Kinky, Coop's former boss and owner of the Bingo Barge, a sleazy gambling boat on the Mississippi. While unearthing clues to absolve Coop, Shay encounters Mafia goons hunting for some extremely valuable nuts.