Mad Grandad and the Mutant River (Flyers)

When Lenny goes fishing with his grandad, he knows they won't catch any ordinary fish. But when they drag up a mermaid in her car, even he's amazed. They all end up fleeing from a crazy fisherman who wants to trap the mermaid. And then they find there is much, much worse waiting for them in the deep and dirty river. Flyer number 14