Possible Clues:

• "The Mousetrap" playwright
• Puzzle setter built this arch across island in stone
• Novelist has a stage hit: 'A Rich Model'
• Creator of 38- and 56-Across
• I crash and hit gate — drunken author
• English writer whose biggest hero was Hercules, mostly
• 'The Body in the Library' writer
• American serial killer hides gun in front of house — a plot she may have penned?
• Story that has no beginning, that has no end — Jesus, that is a writer!
• A biblical city charities abandoned, she wrote