Ever since they were in diapers, Rachel and Agnes have been inseparable. From spending way too much time at the local coffee shop to taking the family's car for joyrides. They were peas in a pod- as close as sisters- that is until the unimaginable happens. One night, Agnes mysteriously vanishes from her bedroom, leaving behind a mysterious token. Left entirely alone after her best friend's disappearance, Rachel is forced to carry on with life. Until six years later, when Agnes turns up unexpectedly. With a strange message and mission. Will Rachel stand by her best friend in what seems impossible?