In her graphic memoirs, New York Times-best selling cartoonist Lucy Knisley paints a warts-and-all portrait of contemporary, twentysomething womanhood, like writer Lena Dunham (Girls). In the next installment of her graphic travelogue series, Displacement, Knisley volunteers to watch over her ailing grandparents on a cruise. (The book's watercolors evoke the ocean that surrounds them.) In a book that is part graphic memoir, part travelogue, and part...