Related Clues:

• 'And Then There Were --'
• Questionnaire box, perhaps
• Zero population
• __ of the above
• Who discovers the perfect crime
• ''And Then There Were ___''
• What one of the little pigs had in 'This Little Pig'
• Who 'knows,' in a 1958 Dion & the Belmonts hit
• The absolute minimum
• Divine service
• ''But answer came there ___'' (Lewis Carroll)
• Amount in an Agatha Christie title
• End of a Christie title
• Fourth little piggie's share
• Zero of the population