Pink Carbide: Lithium Liederkreis

From the back cover:

The year is 2167.

Hunted by the order she once served, Cylea has been forced to flee Britain for the safety offered by the Brotherhood of the Illuminati. Guided by Kari Angeletti, a woman who had once been one of Cylea's own Lumine Navi, Cylea finds sanctuary in the hills of Tuolumne County and discovers that the secrets surrounding her very existence may run far deeper than she ever imagined.

This is the fourth book in the Pink Carbide series.