Teenaged Isobel "Belly" Conklin, whose life revolves around spending the summer at her mother's best friend's beach house, reflects on the tragic events of the past year that changed her life forever.

Sixteen-year-old Anna falls for Will, a New Yorker visiting her resort island for the summer, but she isn't sure if one summer of love will be worth her heart breaking when he leaves at the end of August.

While volunteering for the summer at the local lighthouse in her hometown of Rocky Point, sixteen-year-old Mandy Sullivan falls for the grandson of a local artist, and as the two explore all the lovely adventures the seaside town has to offer, Mandy wonders if their relationship is more than a summer fling--

The discovery of a packet of old letters sends seventeen-year-old Abby Schoenberg to Nantucket to unravel a family mystery about her grandmother's past, but things get complicated when Abby meets the cute grandson of a prominent family who wants to stop her from investigating.