Don Tillman has got his love life planned out. He knows exactly who he wants, but is it who he needs? Love isn't an exact science - but no one told Don Tillman. A thirty-nine-year-old geneticist, Don's never had a second date.

So he devises the Wife Project, a scientific test to find the perfect partner. Enter Rosie - 'the world's most incompatible woman' - throwing Don's safe, ordered life into chaos. But what is this unsettling, alien emotion he's feeling?