When a wealthy Manehattan socialite is murdered in her apartment with a gun, Johnny Northrain and partner Lyra Heartstrings are tasked by Princess Celestia to investigate. The case takes them from the high society of Manehattan to the city's underbelly in pursuit of gun runners and moonshiners. When the head of the gun runners turns out to be one of the most respected citizens of Equestria will they be forced to turn them in or let them go?