The Schuylkill River runs through the heart of Philadelphia. You can’t eat most of the fish you pull out of it, but now some of them want to eat you. Seemingly overnight the eels of northeastern America have become larger, more cunning, and are swarming downriver looking for a new food source. Their veins pulse with an unnatural electric-blue blood and they wait for the rain storm that will allow them to spill forth from the banks of the Schuylkill. A biologist, a down-on-his-luck student, a would-be FBI agent, and a mental patient are drawn together to confront the slithering menace that’s arrived in the City of Brotherly Love. But how can they expect to fight these creatures when it was a web of government conspiracy that brought the eels to Philly in the first place?