Three Parts Romance, two parts nostalgia with a dash of African American cultural history make A Martha’s Vineyard Love Story an enjoyable Island cocktail. This slim novel follows an unlikely pair whose enduring attraction might seem unbelievable to anyone who didn’t fall in love for the first time in August by the ocean. Authors Kathleen McGhee-Anderson and Skip Finley, lifelong Oak Bluffs seasonal residents, know the territory, from Motown lyrics to the smell of Alberto VO5, and their alternating first-person narratives will have you smiling and wincing in equal measure. ($20)