35-year-old Grace Vandenberg orders her life with numbers – from the number of poppy seeds on a muffin to the dimensions of her apartment and the number of steps she takes everywhere. Grace believes that numbers are reality and without them her life would be total chaos. She has been unable to work and cope with life outside of her numbered world...until she meets Seamus O’Reilly. Seamus helps Grace see that there is more to life than counting. But is Grace ready to change? Addition is a beautifully written novel about living life to the fullest while staying true to yourself.