The acclaimed Korean author weaves a "disturbing, beautifully controlled" metaphysical detective story "of doubles, shadows, and parallel worlds" (Financial Times). It's Ayami's final day working the box-office at Seoul's only audio theater for the blind. Her last shift completed, she walks the streets with her former boss, searching for a missing friend. Their conversations take in art, love, food, and the inaccessible country to the north. The next day, Ayami acts as a guide for a detective novelist visiting from abroad. But as they contend with the summer heat, the edges of reality start to fray. Ayami enters a world of increasingly tangled threads, and the past intrudes upon the present as overlapping realities repeat, collide, change, and reassert themselves. Blisteringly original,Untold Night and Dayupends the very structure of narrative storytelling. By one of the boldest and most innovative voices in contemporary Korean literature, and masterfully realized in English by Man Booker International Prize-winning translator Deborah Smith, Bae Suah's hypnotic novel asks whether more than one version of ourselves can exist at once.