The Hunter and the Hunted. Women of the Otherworld

In Off-Duty Angel, dark witch and half-demon Eve Levine is desperate for a little entertainment while her lover, Kristof Nash, is detained in afterlife court--enough to volunteer an extra week's worth of angel corps duty just to pass the time. Luckily something even better comes up: a real celestial bounty-hunter mission to trail a shaman, someone who might prove to be a useful lead in Kristof's court case.
Following the target goes smoothly, until he leads Eve to the British Museum, where she inadvertently steps into a secret dimensional passage and stumbles upon a far more enticing puzzle .