Bisy and Karl-Heinz from "You Must Be Joking!" are back! Cross spider Karl-Heinz and housefly Bisy lead a quiet life in the beech hedge, and everything is as usual: one finds it too boring, while the other thinks there’s too much going on. Then, a dubious invitation disrupts their daily routine. Aunt Kassandra invites them for a meal together. Of course, the two friends know that this isn't without danger, as one can quickly become the main course. Nevertheless, they agree to go. But when they arrive at Aunt Kassandra's web, she has vanished. The web is completely wrecked, as if a battle has taken place. What on earth happened? Was Aunt Kassandra kidnapped? Karl-Heinz and Bisy decide to solve the mystery and find themselves in an exciting adventure. A great fun for the whole family, thrillingly told with hilarious illustrations and pure suspense.