"Ivan" is (not too hard to figure) the head of a local Russian Mob. By the way, whatever happened to the most famous mob: the Mafia? How come you never see that on these CSI shows, only the Russian mob? Just asking.
Anyway, the CSI has to figure out several murders here, which began at a boxing club and wound up in a remote Everglades area. In one of the deaths, one man bit the other guy's carotid artery.
Note: This program always has a slew of a beautiful young women in it, but this one also includes an older (40-50-year-old actress (there is no bio here at IMDb) who is stunningly attractive. I am speaking of Shawn Huff who plays "Susan Madden."