New York private eye Shamus McCoy likes girls, drink and gambling, but by the look of his flat business can't be too hot. So an offer of $10,000 to finds some diamonds stolen in a daring raid with a flame-thrower is too good to miss. His investigations soon get pretty complicated and rather too dangerous. At least along the way he does get to meet Alexis.

When disturbed New York City (NYPD) cop Lacy rescues Sally, a beautiful cellist, from deranged crook Rabbit by shooting Rabbit in cold blood, he sets off a spark of publicity that brands him the city's hero.