The Dividers (The String Weavers - Book 4) - The String Weavers, #4

The chase reverses, with the Weavers becoming the hunted. Dangerous pulsing in the Strings trap Kelsey Hale's Weaver team in a place Captain Delphi Winters recognizes: Universes she and those of her Universe escaped many years before. A Universal Group cruelly ruled by creatures who have harnessed Phoenix Eggs. Creatures who divide Universes for their own destructive gain. No matter how many die in the process.
After the division of a Universe goes wrong, the Dividers are on the hunt for the cause. Hiding isn't enough now. The race is on to stop the Dividers before they themselves are captured. A whirlwind of rebellions, old friendships, and new enemies test them as never before. But Professor Hadrian's shadow casts darkness even here, in the unexpected discovery of a piece of Kelsey's mysterious past. Join Kelsey Hale in a coming of age science fiction adventure across alternate universes and encounters with alien planets, species and societies.
Thrust into a dangerous journey to places she could have never imagined, she is determined to discover the truth of her mysterious past. A truth that will change her life forever. Titles in "The String Weaver" SeriesThe String WeaversThe Phoenix EggsThe Dark PhoenixThe DividersThe Tower of EpnosWhen the Skies FellCelestial Fire