Adamant by Emma L. Adams
Ever since a devastating magical war tore apart Ada Fletcher's homeworld, she and her family have lived undercover on the low-magic Earth. Stuck in a dead-end job in London, Ada has spent her life hiding both her true identity and her forbidden magic from the Inter-World Alliance: the organisation that polices the Passages between Earth and its magical neighbours. At least until a high-ranking Alliance official is murdered, and Ada is arrested as the main suspect. Kay Walker, grandson of the Inter-World Alliance's late founder, expects to spend his first week as an Alliance employee hunting rogue monsters in the Passages, not solving his supervisor's murder. However, the main suspect is a fierce young woman with dangerous magic from a world that should no longer exist… and the closer Kay gets to uncovering the truth, the higher the body count rises. The last thing Ada wants to do is help the infuriating Alliance guard who arrested her, but it soon becomes clear that the Alliance knows too much about Ada's homeworld -- and her magic. More, in fact, than she knows herself. One thing's certain: she's not the only one keeping secrets, and trusting the wrong person might cost more than her life.
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