While spending a family vacation by the lake, siblings Daniel, Nikki, and Tommy Fisher discover that their parents are undercover spies, working for ECCO (Environmental Counter Crime Organization), who are tasked to stop a devious villain from drying up the country's water supply. When the siblings realize their parents' mission is in jeopardy, they form a secret task force called the “Spyders” in order to help them out. Nikki, a well-meaning but impetuous leader; her younger brother Tommy, a cute, irresistible goofball; and her older brother Daniel, an introverted, anxious computer nerd, use their brains, charm, audacity and unbridled enthusiasm to outwit the villain, who has so far eluded their parents. Will the untrained, blundering Spyders succeed?