It's a hot day on Gosling Farm. The pigs are basking in the hot sunshine as Stan drives Little Red Tractor down to the river to cool off. But they find that the wter level in the river is low and full of weed. Patch can't swim and Stan's ducks are unhappy. The weedcutters arrive on the scene and convince Stan that their boat can work in the shallow river. As Paul starts cutting, Steve wades under the bridge to check for weed on the other side. But on the way he meets something grey, ghostly and ghastly, lurking under Whistling Bridge.