The Magical Numbers of Female Bestselling Authors In this week’s piece of applied numerology research, we unpack Sophie Kinsella’s 2019 book “I owe You” as well as other significant success moments along her life path like “The Tennis Party” (her very first book ever, published 1993, immediately went bestseller!) and the 2009 released film centred around her “Shopaholic” books. At least once a month