They're polar opposites.
In fact, the only thing they have in common is that for the next three months, they're living in neighboring beach houses, broke, and bogged down with writer's block.
Until, one hazy evening, one thing leads to another and they strike a deal designed to force them out of their creative ruts: Augustus will spend the summer writing something happy, and January will pen the next Great American Novel. She'll take him on field trips worthy of any rom-com montage, and he'll take her to interview surviving members of a backwoods death cult (obviously). Everyone will finish a book and no one will fall in love. Really.