Loose Changeling

When Nicole catches her husband in bed with another woman, she doesn't just eject him from the premises-she turns his mistress into a mouse. It's not as if she meant to. Far as she knew, she was regular-issue human. So she's mystified (and mortified) when Kailen, Fae-for-hire, shows up on her doorstep the next day, hits on her, and then drops this bomb: she's a Changeling, a Fae raised among mortals. The doorways between the Fae and mortal worlds have been sealed shut for a millennium, but now are opening randomly at an alarming rate, and mortals are turning up dead. Kailen's employers believe she's the only one who can close them. Nicole would be happy to oblige and get her life back to normal, but she's developed a magical block. Not only does she fail to turn her husband's mistress back into a human, she can't do any magic unless she's angry-and she's only angry enough when her husband's in the room. Before Nicole can say "I don't believe in fairies," she's jumping between the Fae and mortal worlds with her soon-to-be-ex, his mousy mistress, and the Fae bodyguard she's increasingly attracted to, trying to figure out who's opening the doorways and why. And she'd better stay mad and learn how to use her powers quickly, because there's a price on her head. Any magic a Changeling performs cannot be undone by another Fae, so the Fae have a simple rule for those like Nicole-kill on sight.