Historical clue formulations

• Grounds — 2023-09-09
• Whodunit plot element — 2022-08-25
• Envy, anger or greed, maybe — 2012-06-15
• Mystery element — 2008-04-20
• Whodunit plot element — 2007-11-07
• Whodunit necessity — 2004-09-25
• Murder mystery necessity — 2001-07-20
• Sleuth's object — 1995-10-05