A carefree New England vacation is just what sixteen-year-old Lucia needs to chase her sadness away. At least, according to her mom, who whisks them away for the summer with her ridiculously wealthy new boyfriend. Nothing bad happens in Nantucket, a charming island with cobblestone streets and million-dollar cottages.

But when Lucia stumbles upon the body of a teenage girl on a beach, the discovery reopens old wounds from her past. With the dead girl's identity a mystery, Lucia takes it upon herself to investigate and crosses paths with Selah and her pack of devil-may-care besties. The three girls are beautiful, chaotic, and a little wild--and they help Lucia forget her crushing sense of grief and loneliness. But as Lucia becomes a part of their shimmering world, she begins to suspect that there are dark secrets hidden in this quiet enclave, and that uncovering them may be the key to solving the dead girl's murder. Not everything on this island is what it seems...