Hope’s story begins in the brief instant that her heart stops. With a photograph as her only artifact, she sets out to unravel the mystery of her past. Kardia weaves together Hope’s present-day work in the science lab with the bittersweet tale of her childhood. Hope comes to understand that the heart surgery she underwent as a child has inexplicably linked her life with another – and it is the outcome of this operation that unlocks the secret of her past. Her journey is an enigmatic one that is only fully understood in its final moments, when Hope reconciles what she believes with the truth she discovers.