In the World follows Elena Marsh, a translator who inherits her estranged father's diary after his death in a foreign country he never spoke about. Armed only with faded photographs and fragments of his handwriting, she journeys across continents to trace the life he lived apart from her. Along the way, she encounters strangers whose stories intertwine with his—refugees, dreamers, and those left behind. As Elena pieces together his hidden past, she must confront her own assumptions about love, loss, and belonging. A luminous meditation on family, memory, and what it truly means to exist in the world.