After graduating from Princeton University with a BA in English Literature, Rhiannon moved to York in the north of England. Her debut novel, A WICKED THING, came out in 2015, and was followed by KINGDOM OF ASHES in 2016 and LONG MAY SHE REIGN in 2017. Outside of writing, her jobs have included working in a comic book store and teaching English in Japan. She speaks Japanese and Korean and is currently studying for a MA in Translation from the University of Leeds.

Outside of writing, she loves video games, Korean dramas, and playing Dungeons and Dragons. She lives in Yorkshire with her cat, Hermione.