Grace Monroe paradoxically shuns artifice, despite wearing a mask of her own. Nine years ago, she stepped off the face of the Earth, and she hasn't looked back since. While Grace never chose a life on the Train, she revels in her quest to rescue children from the False Conductor's heresy. That is, until somebody else comes along... and leads Grace to a dangerous truth. Emily Wong prefers to hide stones with flowers, going so far as to sugarcoat cosmic horrors. She left Earth of her own volition, but a recent brush with death has left her torn between her pursuit of an idealized fantasy... and the harrowing reality of a conscious planet wanting her dead. In a universe where the events of Book 3 never came to pass, what becomes of Grace a year later, when someone neither denizen nor passenger decides to board the Train? ∞ "Replicator's Tide is a planet whose inhabitants, many millennia ago, created a new piece of technology. It is unknown why they created it or what they meant to accomplish through its creation, but we do know that the technology they created grew out of their control and absorbed the entire globe. What they created were self-replicating nanobots, and this is their planet." ~ Owen Dennis