Jayne, Hannah. Underworld Detection Agency chronicles

She's one of the Underworld Detection Agency's best. But her job is really starting to bite . . . Sophie Lawson is a human immune to magic, which comes in handy for helping paranormal beings transition into everyday life. But fallen angel Alex Grace and his search for the Vessel of Souls is one curse she never saw coming. Suddenly an unexplainable string of killings and destruction has even San Francisco's demons fearing for their immortal lives. And Sophie isn't about to trust Alex's all-too-vulnerable charm or his secret agenda. Now their hunt is revealing dangerous secrets about Sophie's past, and a malevolent power hellishly close to turning one irreverent human into the ultimate supernatural weapon

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