Under everyone's noses, Connor, the young son of Nathan and Susan, has been feeding baby crocodiles, right after the violent death of Sadie Bickerman in Lake Placid 2 (2007). As a result, two years later, a new batch of savage reptilians infest the quiet Black Lake of Maine, gobbling down anyone who stands in their way. Once more, the killer crocodiles stain the waters red. Can Nathan, the local game warden, put an end to the nightmare of Lake Placid?