There are 2 books in the Sorcerer to the Crown series. The newest book is The True Queen which came out in 2019.

1
Sorcerer to the Crown

Book cover of Sorcerer to the Crown
One of NPR's 50 Favorite Sci-Fi and Fantasy Books of the Past Decade

Magic and mayhem clash with the British elite in this whimsical and sparkling debut.

The Royal Society of Unnatural Philosophers maintains the magic within His Majesty’s lands. But lately, the once proper institute has fallen into disgrace,…
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2
The True Queen

Book cover of The True Queen

Fairyland's future lies in doubt . . .

The enchanted island of Janda Baik, in the Malay Archipelago, has long been home to witches. And Muna and her sister Sakti wake on its shores under a curse, which has quite stolen away their memories. Their only hope of salvation lies…