chester gould's
A selection from the 1936 series:

When Addie Gothorn, a notorious gambler, is found dead in a hotel, Dick Tracy cancels his planned vacation to investigate the crime. All clues point to Athnel Jones, who is living in Skycrest Apartments. The only problem? No bullet. Someone is on a shooting spree with a gun that leaves no bullets in the bodies of its victims. The only way to solve this crime is for Tracy to call in his top investigator--Junior.
Once captured, Athnel Jones makes a full confession. Tracy discovers a box containing two pistols that shoot paraffine-coated bullets of ice. The ice would melt away and leave no ballistic evidence. The murder weapon is discovered and another crime is solved.