Adamant

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.​

This blend of contemporary fantasy, murder mystery, and an action-packed world-hopping adventure will appeal to fans of the alternate Londons of Ben Aaranovitch and VE Schwab, the modern magic of the Dresden Files, and the genre-blending of Genevieve Cogman’s Invisible Library series and Diana Wynne Jones’s adult novels.