One Smile More - Charlotte Platt

Ena Sinclair, a Scottish mage and spy, abandons her role in a prominent Edinburgh college and escapes to London to avoid an arranged marriage.

But London is not safe: a mage killer is on the hunt...

Abducted by vampires 'for her safety', Ena is terrified the nest owner will drain her to fuel his power but also curious to learn about his magic. Taking this once-in-a-lifetime chance to learn more about what her college had warned were dangerous creatures, Ena finds herself fond of the nest, particularly their bonded leaders, Addison and Tobias.

As survivors of the Immortal War, the pair still navigate a schism in vampire society that they are trying to heal. They now seek a peaceful life and offer Ena protection until she finds her own path.

...and dark things await them all.

Ena's college seeks to forcibly return her to Edinburgh, and a killer is still on the loose. Hidden resentments surface, and Ena pays the price. Magically unstable and isolated, she must rely on her non-magical training to avoid being turned or used as a weapon to harm the nest she has grown to care for.