Related Clues:

• Fingerprints, e.g.
• Holmes quest
• Pie serving
• Criminal game?
• Sleuth's aid
• Sleuthing aid
• Footprint or loose thread, perhaps
• Opus
• King or knight
• ___ de resistance
• Unit of advice
• Miss Scarlet's game
• Not the whole thing
• Detective's quest
• Colonel Mustard game