The End of All Songs: The Dancers at the End of Time Book III

Jherek Carnelian, the Hero at the End of Time, and his lady love, Amelia Underwood, have unexpectedly traveled to the dawn of the Paleozoic Era. Scotland Yard's Inspector Springer is hot on their trail, so it's back to the end of time. If only they could stop the final cataclysm, or at least ignore it.