Elegant and evocative, and now in paperback, Proof of Forever is one of those novels that hooks from the beginning and builds toward a stunning—and unexpected—end, calling to mind Gayle Forman and Ann Brashares.

From author and poet Lexa Hillyer comes the lyrical story of four seventeen-year-old friends who receive an unlikely chance to relive the perfect summer…and the devastating secret that could unravel it all.

Joy, Tali, Luce, and Zoe were once best friends. Now they barely speak. That is, until the fateful flash of a photo-booth camera transports them back in time, to the summer they were fifteen—the summer everything changed.

Photos fade. Friendships dissolve. Summers end. But this one will change the girls forever…again.

• Time Travel Adventure: A magical photo booth sends four estranged friends back two years, forcing them to relive the summer that tore them apart.
• Summer Camp Setting: Between relay races, talent shows, and bonfires at Camp Okahatchee, the girls must navigate old crushes and new tensions.
• Friends to Strangers: Joy, Tali, Luce, and Zoe were once inseparable. Now, they must pretend to be friends again, all while hiding what their future selves know.
• A Devastating Secret: One of the girls is hiding the real reason their friendship ended—a secret that could change everything if they can’t find their way back to the present.