Sworn To Ruin Him: A Dark Enemies To Lovers Fantasy Romance with a Disguised Heroine and a Ruthless King

by H.P. Mallory

761 pages, Paperback

Published December 28, 2025

About the author

I’m a huge fan of anything paranormal and I always have been. I get super excited whenever they have those Twilight Zone Marathon days and anything ghost or vampire related will always attract my attention.

My interests are varied but aside from writing, I’m most excited about traveling. I’m extremely fortunate to have been able to live in England and Scotland, both places really having a profound effect on my books.

Thanks for checking out my books and I hope you enjoy them! Happy Haunting!

H.P.

Reviews

[Fae&Lattes (Chelle) · Rating 4 out of 5]

Sworn to Ruin Him by H.P. Mallory is a dark romantasy set in a brutal version of Camelot that blends familiar legends with a fresh perspective. The story follows Guin, who has been living in hiding while training with Merlin after losing her family to the Pendragon King. Her mission is to infiltrate Arthur’s court and destroy him from within, using powerful magic to disguise herself as a male knight, Sir Lioran. The dual identity creates compelling tension, particularly as Arthur becomes obsessed with Guin in her true form while Lancelot, Arthur’s closest friend and deadliest knight finds himself drawn to Sir Lioran. The book balances spice with strong worldbuilding, character development, and court intrigue, and while the trials are present, they do not overpower the broader story. This was an engaging, plot driven romantasy with emotional stakes and layered relationships. I am very much looking forward to book two.