Six boys race on their scooters through the narrow streets of their Sanità neighbourhood in Naples. They are fearless daredevils, desperate to make money like their role models, and wear designer clothes and the latest sneakers. These 15-year-olds use the city’s rooftops for assault rifle practice. They deal drugs and do not hesitate to use their weapons to take control of the neighbourhood. Their smart leader, Nicola, knows the rules: in order to get his gang into the game and quickly to the top, he challenges one of the old bosses. But whoever is in charge today may well be dead tomorrow. When his girlfriend causes Nicola to be caught between all fronts, he is forced to make a decision.
When flesh-eating piranhas are accidently released into a summer resort's rivers, the guests become their next meal.
Jewel thieves attempt to recover treasure from piranha infested waters. Mistrust and betrayals happen amongst the gang in the quest for gold.
Doctor Baines has been conducting genetic experiments on piranhas and has made them virtually unstoppable. Unfortunately, his assistants, Maggie and Paul, accidentally release the hybrids into the Lost River Lake threatening to destroy everyone in their path. Can they prevent the flesh-eating piranhas from escaping into the ocean and spawning?
After the events at Lake Victoria, the prehistoric school of blood-thirsty piranhas make their way into swimming pools, plumbing, and a newly opened water park.