The Rosie Project by Graeme Simsion

Is a sixteen-page, scientifically valid survey filtering out drinkers, smokers, and late arrivers the best way to find a suitable life partner? Don Tillman, a brilliant yet socially inept professor of genetics, thinks so. In his ordered world, nothing is unplanned or random including finding a wife. 
Rosie Jarman fails the survey because she smokes, drinks and arrives late for dates.  Don disqualifies her as a candidate for "The Wife Project". But Rosie’s quest to find her biological father piques Don's interest and he offers to help her. An unlikely relationship develops as they collaborate on "The Father Project", Don is forced to confront the spontaneous whirlwind that is Rosie―and the realization that, despite your best scientific efforts, you don’t find love, it finds you. 
Hilarious and touching, I heartily recommend "The Rosie Project." A Adams.