Possible Clues:

• Hint, having book set in 1728, say
• 125, to 5
• "Squarely unconventional" Nissan
• Signal for action involving bishop, a solid figure
• Youngster close to stone block
• Circle : sphere :: square : ___
• Square block
• Monopoly die
• Three-dimensional block served up in ice bucket
• Young animal on earth possibly eight