FLINTRIDGE, MICHIGAN.It's Kathleen O'Halloran's hometown. It's also Slater Kowalski's. And it's a town divided.Kat and her exuberant family live in the part of Flintridge known as the Hill; Slater is from the Ridge.Slater is the president of Flintridge Motors; Kat's family works for his rival. Ridge and Hill have always functioned as almost separate communities, but the boundaries start to blur wh...