Possible Clues:

• 'Once upon --'
• Neil Young "Comes ___"
• Grisham's '___ to Kill'
• Repeated phrase in Ecclesiastes
• One at --
• 'Once upon -- ...'
• "Once upon —"
• 'One Day at ___'
• 'Once upon ___ ...'
• '___ to Kill' (Grisham novel)