Here is a list of The Shades of Magic Books in Order.
The Shades of Magic
(#0.5) – A Royal Affair (2020)
#1 – A Darker Shade of Magic (2015)
From the blurb:
Kell is one of the last Antari―magicians with a rare, coveted ability to travel between parallel Londons; Red, Grey, White, and, once upon a time, Black.
Kell was raised in Arnes―Red London―and officially serves the Maresh Empire as an ambassador, traveling between the frequent bloody regime changes in White London and the court of George III in the dullest of Londons, the one without any magic left to see.…
#2 – A Gathering of Shadows (2016)
#3 – A Conjuring of Light (2017)
Threads of Power
This series is set in the same world, with new characters.
#4 – The Fragile Threads of Power (2023)
From the blurb:
A new door opens…
Once there were four worlds, nestled like pages in a book, each pulsing with fantastical power and connected by a single city: London.
After a desperate attempt to prevent corruption and ruin in the four Londons, there are only three―Grey London, thriving but barely able to remember its magical heritage; Red London, ruled lately by the Maresh family, flourishing and powerful; and White London, left to brutality and decay.…