Possible Clues:

• 'Rosemary's Baby' author
• 'The Stepford Wives' author
• ''Rosemary's Baby'' author
• Stepford creator
• 'Deathtrap' playwright
• "The Stepford Wives" novelist
• "Deathtrap" playwright
• 'A Kiss Before Dying' author
• Stephen King called him ''the Swiss watchmaker''
• 1954 Edgar Award winner