A Daughter's Ransom Series:
The TetraWorlds live in ignorance of each other's existence. One fallen behind in a Medieval time of fantastic and dangerous creatures, another fallen asleep in the comfort of their Victorian age, and the last torn apart by its own Modern innovation. When a dark threat rises up against them--one so quiet that none know to stop it, a Guard from each world must be called to protect their planet's source. But what will happen when these worlds entwine?