From To All the Boys I've Loved Before author Jenny Han, The Summer I Turned Pretty revolves around Belly, who has spent every summer since childhood in Cousins Beach with Jeremiah and Conrad Fisher, the sons of her mom's BFF. Though her relationship with the Fisher brothers had always been platonic (save for her crush on the older of the two brothers, Conrad), there finally comes a summer when the Jeremiah and Conrad no longer see Belly as their "little sister."