Crucible Luciferum. Crossroads of Crosstime, #4

Across his many lives and faces, Miguel Murphy had come to a fairly unique understanding of how the world was ordered - only to see that understanding unravel in a world that shouldn't even exist. Saul Ellsberg had gone from being an author of scientific romances to being the protagonist of one, discovering unusual - if useful - abilities along the way. Harnessing those abilities could easily be the most important thing he had ever done in his life.
Kayce Cullen was tired of mysteries, tired of secrets, tired of the onionskin layers of nested realities that kept peeling away before her eyes. All she really wanted was to go home to her wife. Unfortunately, the mysteries weren't quite done with her yet.