Wen Apollo dreams of seeing the world beyond the small riverside town where she grew up. But operating the local mailboat keeps her tethered to Coopersville. Islands dot the river, and their residents rely on her to deliver everything from food and medicine to pet food and plumbing supplies.

On a raw spring day, Wen goes to Owl Island—the summer home of the illustrious Gage family—to deliver a package. It’s addressed to the family’s oldest daughter, Estelle, a woman Wen has long admired from afar.

Estelle Gage fled to the islands seeking solitude and an escape. With the deadline for her latest novel fast approaching, her sole focus is to write. But when the handsome mailboat captain shows up on her doorstep, writing is no longer the only thing on her mind.

A steady stream of packages continues to bring Wen back to Owl Island—and to Estelle. But as summer looms, so does the impending arrival of Estelle’s family. The return of the Gages will most certainly spell the end to Estelle and Wen’s idyllic time cloistered together on the island. What will that mean for their budding relationship?