Overboard

On her way home from an all-night surveillance job, V.I. Warshawski's dogs lead her on a mad chase that ends when they find a badly injured teen hiding in the rocks along Lake Michigan. The girl only regains consciousness long enough to utter one enigmatic word. V.I. helps bring her to a hospital, but not long after, she vanishes before anyone can discover her identity.

As V.I. attempts to find her, the detective uncovers an ugly consortium of Chicago power brokers and mobsters who are prepared to kill the girl before VI can save her. And soon it becomes clear that V.I.'s own life is in jeopardy as well.  Book 21 of series.