Horatio and the CSI team are pit against Miami's Russian mob after a barbaric double homicide in the Everglades.

Miami's wealthiest appear to be targeted in a series of stabbings and robberies, and evidence leads back to Russian mobster Ivan Sarnoff, who was last seen in prison, mocking Horatio.

Horatio fights to save Yelina and when Delko goes against Calleigh's plea and helps his dangerous father, his life is put in jeopardy.