When a family takes a trip in their nine-foot aluminum pram, down an unknown stretch of river, will they make it to the bridge where the car is parked before dark or will they spend the night "Lost on Big Otter River "? Amy and Matt are bursting with excitement when Dad packs up the car, and they take off for Big Otter River with their favorite fishing pram strapped on top. Because Dad carelessly plans the trip and under-estimates the distance, things become uncertain, but when a stranded blind calf needs their help, the adventure takes a turn for the worse. Confident they have already passed the halfway point, Dad agrees to try rescuing the blind calf. As he and Amy lead the calf down-river on foot, Matt struggles to keep the pram from passing them in the strong current. Believing they are nearing the end of their journey, Dad allows Matt to go on alone while they continue leading the calf slowly downstream. It is only when they suddenly come upon the true halfway point that Dad realizes the gravity of his mistake. Matt will be alone for many hours and none of them may reach the bridge before dark. Can Dad and Amy find Matt in time? Will they all make it safely to the bridge? In this river adventure, you never know what could be just around the next bend.