Hidden Prey

I liked this book written by John Sandford. One night on the docks, a Russian seaman is assassinated and a few days later a homeless woman is strangled to death. State detective Lucas Davenport suspects that the murderer was trying to eliminate a witness, but when he receives a call from a woman trying not to be located, he realizes that she is the real witness. He is partnered with a Russian spy who has been sent to America with her own agenda. This is the 15th novel in the series.