In this third novel in the Marshall "Mars" Bahr series, author K.J. Erickson has delivered a terrific plot, engaging characters, and a nail-biter finish that comes out of left field. Mars is in his final days as the lead detective assigned to a special unit created by the previous police chief. Because of a regime change in the department, Mars and his intelligent assistant Nettie are happy to be moving to the Cold Case Unit at the State's Bureau of Criminal Apprehension. But one last murder intervenes.