No One’s Bride by Adele Clee

For Ailsa MacTavish, collecting old books was as much a hobby as her verbal spars with Viscount Denton. They were bitter rivals, barely friends, but she never felt more alive than when they clashed swords. As he’d made an oath not to marry for years, she considered him a safe companion for a would-be spinster.
But one mistake at an auction leaves her in possession of an old grimoire. It wouldn’t be a problem had a mystic at the fair not told her she would marry a man who puts her under a spell.
Now someone is willing to resort to great lengths to steal the book, and danger lurks in the shadows. Forced to work with the handsome viscount, Ailsa fears there might be some truth to the mystic’s prediction. The more time she spends with Lord Denton, the more his wicked charm leaves her enchanted.