Imagine staring into the face of a loved one with no recollection of who they are. Every person a stranger. Daisy O'Reilly's inability to recognize faces, a cognitive disorder resulting from a childhood accident, causes her to rely heavily upon her twin sister, Poppy. Perhaps too much so. Overwhelmed by Daisy's needs, Poppy anticipates the freedom her upcoming wedding will bring-a chance to relinquish her obsessive worries about Daisy and escape the clutches of guilt from one hazy day when the girls were seven. When they were still invincible. With a thriving floral photography career but a floundering love life, Daisy questions how strong she will be on her own. And who she might become without Poppy living down the hall or offering a deluge of reminders during each social interaction. But for the O'Reilly sisters to properly let go, they must first understand what they're holding on to.