Dead of Summer By Jessa Maxwell

Years after her best friend mysteriously disappeared from a remote New England island, a young woman returns in search of answers.

Orla O’Connor hasn’t been to the isolated New England enclave of Hadley Island since she graduated from high school a decade ago. As a teenager, her best friend Alice disappeared from its shores without a trace—but with plenty of rumors. Now Orla returns to her family’s beachfront home to clean it out before her parents sell it. The island and her best friend’s empty house next door are stirring up memories she would like to avoid.

Then there are the locals, always gossiping and watching Orla’s every move. Worst of all, David, Orla’s childhood crush and son of a wealthy Manhattan family, is back for the summer with his new, impossibly pretty girlfriend, Faith.

Meanwhile, local Henry hasn’t left his house since Alice disappeared, in an attempt to let the accusations against him die down—except they never have. Orla’s return has shaken him, and lately he’s been seeing strange things through his telescope: shadowy figures walking on the beach in the middle of the night and a light on in an upstairs window of Alice’s long-abandoned childhood home.

When another person on the island disappears, Orla, David, and Henry find themselves pulled into an eerie mystery that will haunt them for the rest of their lives.