Related Clues:

• Detective, slangily
• Sleuth (Sl.)
• Gumshoe, slangily
• Pulp protagonist, perhaps
• Slangy sleuth
• Private dick
• Private eye, briefly
• Sam Spade type
• Pulp fiction gumshoe
• Spade, e.g., for short
• Clue analyzer, in slang
• Gumshoe, briefly
• Dick Tracy, e.g.
• Hammett's Spade, e.g.
• Short investigator?