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Shadow Kin (Novel of the Half-Light City) (edition 2011)
by M.J. Scott
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When a beautiful wraith, a shadow who slips between worlds, is ordered by her mastor, the Blood Lord Lucius, to kill Simon DuCaine, a powerful sunmage who has promised to set her free, she must choose between trust, loyalty, the shadows and the light.
(summary from another edition)