 Late at night in an empty greasy spoon, a mug coolly kills the owner, but when the register yields only $14, he just shrugs and unscrews his silencer. The diner was Lt. Jacoby s teenage hangout, so he rabidly pursues the murderer, while struggling to prevent a mob leader from muscling in on Jacoby s side of the river. To help Jacoby, Peter Gunn pays diminutive pool shark Babby (Billy Barty) for a lead.