When Herbert Timothy Simple is kicked off the police squad for incompetence, he changes his name to Tim Diamond ad opens his own private detective agency. The only problem is that Tim Diamond is the worst detective in the world. Luckily , his young brother, thirteen-year-old Nick, is the real brains beind the operation! But then the vertically challenged Johnny Naples entrusts Tim Diamond with a package worth over three million pounds. Next day, Johnny’s dead, Tim feels the heat, and Nick gets the package--- and every crook in town on his back!