The Rosie Project by Graeme Simson

Meet Don Tillman, a brilliant genetics professor at an Australian university. Within the first few pages, the reader realizes that Don isn't your ordinary person. He's a bit socially inept--he has few friends beside Gene (a fellow professor studying attraction to women of different decent, by, of course, sleeping with women from different countries) and Claudia, plans his daily schedule down to the minute, and calculates people's BMIs upon their first meeting. As the reader learns a bit more about Don, they realize that Don's social inadequacies have clearly hindered him from falling in love. Realizing that the perfect girl is the part missing from his life, Don takes it upon himself to create a questionnaire with crazy, detailed questions to find the most suitable female partner.

Enter Rosie, who is nothing like Don. She's constantly late, disorganized, and is in no way a suitable match for Don. When Don thinks that Rosie is a woman who filled out his questionnaire, he garners up enough courage to ask her to dinner. The first night Don and Rosie meet turns into a fiasco, in true Don fashion. As the two begin to talk about their lives, Rosie tells Don that she doesn't know who her father is. This piques the ear of Don, the genetics professor. It's then that the Father Project develops. Don agrees to use his love of academia and the study of genetics to help Rosie find her dad.

As the two of them work to find out who Rosie's dad is, it seems as if a chemistry is built. 

The Rosie Project will have you laughing until the very end, while constantly rooting for the socially awkward protagonist to find the love that he so desperately deserves.