Just One Trilogy by Gayle Forman

A single day in Paris changes everything when Allyson Healey meets Willem De Ruiter, a free-spirited actor who introduces her to a life of spontaneity and self-discovery. Their connection is instant and profound — but when Willem disappears the next morning, Allyson’s search for him becomes a deeper journey into identity, courage, and the meaning of love. Spanning Just One Day, Just One Year, and Just One Night, Gayle Forman’s trilogy follows two souls bound by a brief encounter, tracing their separate paths across continents and years as they learn that sometimes the most life-changing moments are the ones that begin by chance.