The letters in her name (19). The steps she takes every morning to the local café (920); the number of poppy seeds on her slice of orange cake, which dictates the number of bites she’ll take to finish it. Grace counts everything, because numbers hold the world together. And she needs to keep an eye on how they’re doing.Seamus Joseph O'Reilly (also a 19, with the sexiest hands Grace has ever seen) thinks she might be better off without the counting. If she could hold down a job, say. Or open her kitchen cupboards without conductng an inventory, or make a sandwich containing an unknown number of sprouts.Grace’s problem is that Seamus doesn’t count. Her other problem is…he does.Addition is a fabulous debut novel. Grace is witty, flirtatious and headstrong. She’s not a bit sentimental but even so, she may be about to lose track of the number of ways she can fall in love.