Odile is poised to join the Conseil, the elite committee that controls passage between identical towns separated by mountains. Each town exists in a different time period - twenty years apart from its neighbours. The only permitted crossings are mourning tours, where people secretly view loved ones who have died in their own time but are still alive in others. When Odile accidentally witnesses a mourning tour for her friend Edme - the only boy to ever understand her - she realises he must be destined to die. Sworn to secrecy by the Conseil, Odile finds herself drawn into a devastating lifelong dilemma: to preserve the town`s carefully protected timeline, or to risk everything and try to rescue her one chance at happiness...