"Run, Gwen. Run as far and as hard as you can. Because when I catch you... You will belong to me."

When she shattered the Iron Crystal and returned magic to Avalon, Gwen also shattered Mordred's heart. Torn between her passion for Mordred and his rage at her betrayal, she fled into the wilds.

Gwen's choice has transformed Avalon, and the island teems with magical wonders freed from the crystal. But Gwen also released the vicious and chaotic elementals. Desperate for revenge against Mordred, some of them see Gwen as an ally, others as a hostage.

Now, the Prince in Iron hunts Gwen relentlessly, though at night he visits her in dreams, unable to break the desire that binds them. She is his weakness. If his enemies captured her, he knows that he would make any deal, break any vow to return her to his side.

As the elementals prepare for battle, Gwen will face an impossible choice. Can she stand by as Avalon's magic is destroyed once again? Or will she fight to overthrow the man she loves?

Building from slow-burn to steam, the Iron Crystal series is packed with alluring villains, dark magic and heart-stopping twists. If you're a fan of Sarah J. Maas, Laura Thalassa and Carissa Broadbent, To Bind a Dark Heart will have you reading late into the night.

See why readers are falling for Kathryn Ann Kingsley's irresistible enemies-to-lovers romance:

"Ahh-mazing. Utterly amazing... A magical slow burn that had me reading faster with tension growing between characters... If you love fantasy romance, surprise kiss, tension, magic, read this. I am melting with excitement for the next book." Goodreads reviewer ?????

"A slow burn story full of angst, sexual tension, and betrayal. Fast-paced and addictive, you won't be able to put it down!" Goodreads reviewer ?????

"I loved it!!! Hot and brooding and morally gray and mysterious and villainous... and so, so good in so many ways!!!!" @thenarnianreader_ ?????

"Captivating and addicting... This book is a must-read if you like romances where enemies become lovers, baddies who are seductive, and magical, dangerous worlds." Goodreads reviewer ?????

"I absolutely LOVED this book... I would give this ten stars if I could!!! I will be recommending this to everyone." Goodreads reviewer ?????

"Kathryn Ann Kingsley is the queen of writing morally gray male love interests! And of books that you will read in one sitting. I absolutely devoured To Charm a Dark Prince." @book.ish.paradise ?????

"This book had me tearing through it!... Mordred. Holy hotness, Batman. I loved his character. Broody, flirty, charismatic... He lit up every scene he was in." Goodreads reviewer ?????

"I absolutely loved this! Morally gray anti-hero, slow-burn romance... Anything with a dark and broody prince steals my attention. Mordred has a great, dry sense of humour and witty banter with Gwen... I'm so excited to read the next book in this series." Coffeelitandprosecco ?????

"ACOTAR fans, you'll adore this too. It's spicy, dark, angsty, dramatic... Highly recommend." Goodreads reviewer ?????