Uncle Theodor has died and is giving three million guilders to whoever finds the blue diamond. There are two heirs, Mrs. Kakel and Mrs. Ter Beek. They have seven days to find the diamond. Both receive a tape with information on how and where to find the diamond. Mrs. Ter Beek goes searching with her son. Mrs. Kakel, however, has Bram, Lam, and her son follow Mrs. Ter Beek so that the three of them can take the diamond from Mrs. Ter Beek. Who will have the last laugh?