"Magic Triumphs (Kate Daniels)" by Ilona Andrews

"Magic Triumphs (Kate Daniels)" by Ilona Andrews
 https://www.amazon.com/Magic-Triumphs-Daniels-Ilona-Andrews/dp/0425270726/
Book number ten of a ten book paranormal romance dark fantasy series. There are short stories and successive books to the series also.  I read the well printed and well bound MMPB published by Ace in 2019 that I bought new on Amazon recently.  Note that “Ilona Andrews” is the pseudonym for a husband and wife writing team.  I have purchased several of the successor books for later reading.
Kate Daniels is a mercenary in Atlanta, Georgia and engaged to the former Beast Lord.  All of her life, she has been running from her father, a 5,000+ year old all powerful mage currently known as Roland. In the Bible, he is known by another name.  Roland has killed all of her brothers and sisters so she expected the same treatment when he found her.  Now Kate is trying to figure how to live with him knowing where she is and popping up in her life constantly.  But now someone from her father's distant past has also awakened, an even more magical being than her father.  And Kate and Curran have a son now, a half beast half magic son.
Kate Daniels's universe sucks.  Forty years ago, the tech world crashed over the entire Earth and was replaced by the magic world in the form of a magic flare.  Guns don't work, cars don't work, electricity and phones do not work.  But magic works.  Good magic and bad magic.  After a week, the tech world came back to a drastically changed world. And radically fewer humans.  And the magic world came back after a while.  And the tech world came back after that.  And so on and so forth.  Each world can last a few weeks or a few hours.
I liked everything about the story.  I especially liked the very clear distinction between the tech time and the magic time.  I had never thought about it that way.  The series may be inspired by "Ariel" by Steven Boyett and "Dies The Fire" by S. M. Stirling except those never interchange the tech time and the magic time, they just transitioned to the magic time.
The authors have a website at:
    https://www.ilona-andrews.com
My rating: 5 out of 5 stars
Amazon rating: 4.8 out of 5 stars (11,886 reviews)
Lynn