Ben Coffin has never been one for making friends. As a former foster kid, he knows people can up and leave without so much as a goodbye. Ben prefers to spend his time with the characters in his favorite sci-fi books...until he rescues an abandoned mutt from the alley next-door to the Coney Island Library. Scruffy little Flip leads Ben to befriend a fellow book-lover named Halley—yes, like the comet—a girl unlike anyone he has ever met. Ben begins thinking of her as "Rainbow Girl" because of her crazy-colored clothes and her laugh, pure magic, the kind that makes you smile away the stormiest day. Rainbow Girl convinces Ben to write a novel with her. But as their story unfolds Ben's life begins to unravel, and Ben must discover for himself the truth about friendship and the meaning of home.