Yehude, Zackeus, and Mizraim are three Hebrew boys from Gezer whose acts of vandalism and rebellion against the ruling Philistine class tend to land the local Hebrew community in hot water. When the three boys pelt Sidon with fish as an act of political resistance during his trip to Gezer, he retaliates by doubling the tribute of grain the Hebrews of the town must pay to the local temple of Dagon.
Far from deterring Yehude, Zackeus, and Mizraim from their acts of civil disobedience, Sidon's harsh reprisals only serve to fan the flames of the boys' desire to strike back at Philistine tyranny. Sneaking into the temple of Dagon, Yehude, Zackeus, and Mizraim plaster the idol with mud, then brag about their deed to Zarah and Branan, who've just returned from a fruitless fox hunt.
Realizing that Sidon will persecute the local Hebrews even more than he already has because of this act of desecreation, Zarah requests Branan's help in carrying the large statue of Dagon out of the temple down to the town fountain to be washed. When the siblings can't gain access to the fountain because of the local city patrol, they decide to transport the statue down to the riverbank and splash the idol clean there.
Unfortunately, just before Zarah and Branan are able to return the idol to its place in the temple, Branan loses grip on the statue and it falls back into the mud, filthier than it was when they started. In their rush to get the idol back on its dais before the temple priests arrive, Zarah and Branan place Dagon facing the wrong way. As luck would have it, however, the Dagon priests, who enter the temple a few seconds after Branan and Zarah leave, interpret the mucky, misplaced idol as a sign from the gods that the Philistines' treatment of the Hebrews has been too harsh.
Just when Yehude, Zackeus, and Mizraim are convinced that their subversive political efforts have been completely ineffective, they notice that the temple priests have opened the storehouses and are returning food to the Hebrews on account of the filthy Dagon "omen."