When Penny Weaver joins the new Riverdell Farmers' Market, things start out badly and get much worse. The county's unpopular poultry agent is poisoned, apparently after drinking fruit punch provided by the abrasive and market manager, who claims innocence but is arrested. The state agricultural department threatens to close the market, so Penny and her friend Sammie rush to uncover the truth. What caused the agent's death, and who put it in the punch?