Andy is a front desk clerk with a little ambition until he finds his muse. Hayley is a beautiful shampoo girl chasing big dreams in NYC. When their worlds collide in a hapless run-in, the starstruck lovers assume false identities and follow the script of life from the same self-improvement book which lead to potentially bigger problems than they could have ever dreamed.

Each year the population of sleepy Lake Victoria, Arizona explodes from 5,000 to 50,000 residents for the annual Spring Break celebration. But then, an earthquake opens an underwater chasm, releasing an enormous swarm of ancient Piranha that have been dormant for thousands of years, now with a taste for human flesh. This year, there's something more to worry about than the usual hangovers and complaints from locals, a new type of terror is about to be cut loose on Lake Victoria.