I just finished Rhapsody, book one of Elizabeth Haydon's Symphony of Ages

I just finished Rhapsody, book one of Elizabeth Haydon's Symphony of Ages.

Three left early and arrived late, according to prophecy, across Time itself up into a world riven by the unfamiliar, and an unfamiliar history, yet threatened by a familiar foe born out of primal flames. Truly in all my vast reading this is one of the most unique – in plot, characters, and world – I have ever come across! For the two who met and loved on the other side of Time have, souls ravaged by it, met again. But who truly is Meridion the Time Editor?